feat(poll): add partial update poll endpoint

- Add PartialUpdatePollRequestData with PartialUpdatePollRequest builder class
- Add partialUpdate() static factory method
- Add PATCH /polls/{poll_id} service method
- Add unit tests for partial update with set and unset

Author: GwFreak01

src/main/java/io/getstream/chat/java/models/Poll.java

@@ -367,6 +367,46 @@ protected Call<UpdatePollResponse> generateCall(Client client) throws StreamExce
     }
   }
 
+  /** Request data for partially updating a poll. */
+  @Builder(
+      builderClassName = "PartialUpdatePollRequest",
+      builderMethodName = "",
+      buildMethodName = "internalBuild")
+  @Getter
+  @EqualsAndHashCode
+  public static class PartialUpdatePollRequestData {
+    @Singular
+    @Nullable
+    @JsonProperty("set")
+    private Map<String, Object> setValues;
+
+    @Singular
+    @Nullable
+    @JsonProperty("unset")
+    private List<String> unsetValues;
+
+    @Nullable
+    @JsonProperty("user_id")
+    private String userId;
+
+    @Nullable
+    @JsonProperty("user")
+    private UserRequestObject user;
+
+    public static class PartialUpdatePollRequest extends StreamRequest<UpdatePollResponse> {
+      @NotNull private String pollId;
+
+      private PartialUpdatePollRequest(@NotNull String pollId) {
+        this.pollId = pollId;
+      }
+
+      @Override
+      protected Call<UpdatePollResponse> generateCall(Client client) throws StreamException {
+        return client.create(PollService.class).partialUpdate(this.pollId, this.internalBuild());
+      }
+    }
+  }
+
   /** Request data for creating a poll. */
   @Builder(
       builderClassName = "CreatePollRequest",
@@ -460,4 +500,16 @@ public static GetPollRequest get(@NotNull String pollId) {
   public static UpdatePollRequestData.UpdatePollRequest update() {
     return new UpdatePollRequestData.UpdatePollRequest();
   }
+
+  /**
+   * Partially updates a poll.
+   *
+   * @param pollId the poll ID
+   * @return the created request
+   */
+  @NotNull
+  public static PartialUpdatePollRequestData.PartialUpdatePollRequest partialUpdate(
+      @NotNull String pollId) {
+    return new PartialUpdatePollRequestData.PartialUpdatePollRequest(pollId);
+  }
 }

src/main/java/io/getstream/chat/java/services/PollService.java

@@ -3,13 +3,15 @@
 import io.getstream.chat.java.models.Poll.CreatePollRequestData;
 import io.getstream.chat.java.models.Poll.CreatePollResponse;
 import io.getstream.chat.java.models.Poll.GetPollResponse;
+import io.getstream.chat.java.models.Poll.PartialUpdatePollRequestData;
 import io.getstream.chat.java.models.Poll.UpdatePollRequestData;
 import io.getstream.chat.java.models.Poll.UpdatePollResponse;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import retrofit2.Call;
 import retrofit2.http.Body;
 import retrofit2.http.GET;
+import retrofit2.http.PATCH;
 import retrofit2.http.POST;
 import retrofit2.http.PUT;
 import retrofit2.http.Path;
@@ -46,4 +48,15 @@ Call<GetPollResponse> get(
    */
   @PUT("polls")
   Call<UpdatePollResponse> update(@NotNull @Body UpdatePollRequestData request);
+
+  /**
+   * Partially updates a poll.
+   *
+   * @param pollId The poll ID
+   * @param request The partial update request data
+   * @return A response with the updated poll
+   */
+  @PATCH("polls/{poll_id}")
+  Call<UpdatePollResponse> partialUpdate(
+      @NotNull @Path("poll_id") String pollId, @NotNull @Body PartialUpdatePollRequestData request);
 }

src/test/java/io/getstream/chat/java/PollTest.java

@@ -201,4 +201,64 @@ void whenClosingPoll_thenNoException() {
     Assertions.assertNotNull(updateResponse);
     Assertions.assertTrue(updateResponse.getPoll().getIsClosed());
   }
+
+  @DisplayName("Can partially update a poll with set")
+  @Test
+  void whenPartiallyUpdatingPollWithSet_thenNoException() {
+    // Create a poll first
+    CreatePollResponse createResponse =
+        Assertions.assertDoesNotThrow(
+            () ->
+                Poll.create()
+                    .name("Original Partial " + UUID.randomUUID())
+                    .description("Original description")
+                    .userId(testUserRequestObject.getId())
+                    .option(PollOptionRequestObject.builder().text("A").build())
+                    .request());
+
+    String pollId = createResponse.getPoll().getId();
+
+    // Partial update the poll
+    UpdatePollResponse updateResponse =
+        Assertions.assertDoesNotThrow(
+            () ->
+                Poll.partialUpdate(pollId)
+                    .setValue("name", "Partial Updated Name")
+                    .userId(testUserRequestObject.getId())
+                    .request());
+
+    Assertions.assertNotNull(updateResponse);
+    Assertions.assertEquals("Partial Updated Name", updateResponse.getPoll().getName());
+    // Description should remain unchanged
+    Assertions.assertEquals("Original description", updateResponse.getPoll().getDescription());
+  }
+
+  @DisplayName("Can partially update a poll with unset")
+  @Test
+  void whenPartiallyUpdatingPollWithUnset_thenNoException() {
+    // Create a poll first
+    CreatePollResponse createResponse =
+        Assertions.assertDoesNotThrow(
+            () ->
+                Poll.create()
+                    .name("Poll with description " + UUID.randomUUID())
+                    .description("To be removed")
+                    .userId(testUserRequestObject.getId())
+                    .option(PollOptionRequestObject.builder().text("A").build())
+                    .request());
+
+    String pollId = createResponse.getPoll().getId();
+
+    // Partial update to unset description
+    UpdatePollResponse updateResponse =
+        Assertions.assertDoesNotThrow(
+            () ->
+                Poll.partialUpdate(pollId)
+                    .unsetValue("description")
+                    .userId(testUserRequestObject.getId())
+                    .request());
+
+    Assertions.assertNotNull(updateResponse);
+    Assertions.assertNull(updateResponse.getPoll().getDescription());
+  }
 }