feat(poll): add delete poll endpoint

- Add DeletePollRequest class with userId support
- Add delete() static factory method
- Add DELETE /polls/{poll_id} service method
- Add unit test for poll deletion

Author: GwFreak01

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

@@ -407,6 +407,26 @@ protected Call<UpdatePollResponse> generateCall(Client client) throws StreamExce
     }
   }
 
+  /** Request for deleting a poll. */
+  @Getter
+  @EqualsAndHashCode
+  @RequiredArgsConstructor
+  public static class DeletePollRequest extends StreamRequest<StreamResponseObject> {
+    @NotNull private final String pollId;
+    @Nullable private String userId;
+
+    @NotNull
+    public DeletePollRequest userId(@NotNull String userId) {
+      this.userId = userId;
+      return this;
+    }
+
+    @Override
+    protected Call<StreamResponseObject> generateCall(Client client) throws StreamException {
+      return client.create(PollService.class).delete(this.pollId, this.userId);
+    }
+  }
+
   /** Request data for creating a poll. */
   @Builder(
       builderClassName = "CreatePollRequest",
@@ -512,4 +532,15 @@ public static PartialUpdatePollRequestData.PartialUpdatePollRequest partialUpdat
       @NotNull String pollId) {
     return new PartialUpdatePollRequestData.PartialUpdatePollRequest(pollId);
   }
+
+  /**
+   * Deletes a poll.
+   *
+   * @param pollId the poll ID
+   * @return the created request
+   */
+  @NotNull
+  public static DeletePollRequest delete(@NotNull String pollId) {
+    return new DeletePollRequest(pollId);
+  }
 }

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

@@ -6,10 +6,12 @@
 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 io.getstream.chat.java.models.framework.StreamResponseObject;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import retrofit2.Call;
 import retrofit2.http.Body;
+import retrofit2.http.DELETE;
 import retrofit2.http.GET;
 import retrofit2.http.PATCH;
 import retrofit2.http.POST;
@@ -59,4 +61,15 @@ Call<GetPollResponse> get(
   @PATCH("polls/{poll_id}")
   Call<UpdatePollResponse> partialUpdate(
       @NotNull @Path("poll_id") String pollId, @NotNull @Body PartialUpdatePollRequestData request);
+
+  /**
+   * Deletes a poll.
+   *
+   * @param pollId The poll ID
+   * @param userId Optional user ID
+   * @return A response indicating success
+   */
+  @DELETE("polls/{poll_id}")
+  Call<StreamResponseObject> delete(
+      @NotNull @Path("poll_id") String pollId, @Nullable @Query("user_id") String userId);
 }

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

@@ -6,6 +6,7 @@
 import io.getstream.chat.java.models.Poll.PollOptionRequestObject;
 import io.getstream.chat.java.models.Poll.UpdatePollResponse;
 import io.getstream.chat.java.models.Poll.VotingVisibility;
+import io.getstream.chat.java.models.framework.StreamResponseObject;
 import java.util.UUID;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.DisplayName;
@@ -261,4 +262,27 @@ void whenPartiallyUpdatingPollWithUnset_thenNoException() {
     Assertions.assertNotNull(updateResponse);
     Assertions.assertNull(updateResponse.getPoll().getDescription());
   }
+
+  @DisplayName("Can delete a poll")
+  @Test
+  void whenDeletingPoll_thenNoException() {
+    // Create a poll first
+    CreatePollResponse createResponse =
+        Assertions.assertDoesNotThrow(
+            () ->
+                Poll.create()
+                    .name("Poll to delete " + UUID.randomUUID())
+                    .userId(testUserRequestObject.getId())
+                    .option(PollOptionRequestObject.builder().text("A").build())
+                    .request());
+
+    String pollId = createResponse.getPoll().getId();
+
+    // Delete the poll
+    StreamResponseObject deleteResponse =
+        Assertions.assertDoesNotThrow(
+            () -> Poll.delete(pollId).userId(testUserRequestObject.getId()).request());
+
+    Assertions.assertNotNull(deleteResponse);
+  }
 }