feat: Add getMetadata for RequestContext

[flex-myeonghyeon]

Description

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @flex-myeonghyeon, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the capability to access metadata associated with a request within the RequestContext. This enhancement provides a standardized way to retrieve additional context information, improving the flexibility and utility of the request handling process. The change includes the necessary method implementation and corresponding tests to ensure correctness.

Highlights

• New Feature: Metadata Access: A new getMetadata() method has been added to the RequestContext class, allowing retrieval of request-specific metadata as a Map<String, Object>.
• Test Coverage: Comprehensive unit tests have been introduced to validate the functionality of the new getMetadata() method, including cases for null metadata and successful retrieval.

Changelog

• server-common/src/main/java/io/a2a/server/agentexecution/RequestContext.java
  • Imported java.util.Map to support map-based metadata.
  • Added a public method getMetadata() which returns the request metadata as a Map<String, Object> or null.
• server-common/src/test/java/io/a2a/server/agentexecution/RequestContextTest.java
  • Imported java.util.HashMap for test data creation.
  • Added an assertion to testInitWithoutParams to confirm getMetadata() returns null when no parameters are provided.
  • Introduced testInitWithParamsMetadata to verify that getMetadata() correctly returns the metadata passed during RequestContext initialization.

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[gemini-code-assist]

Code Review

The pull request successfully adds the getMetadata method to the RequestContext class, enabling access to request metadata. The implementation is straightforward and includes relevant unit tests to verify the new functionality. The suggested improvement to return an unmodifiable map for better encapsulation and consistency with existing methods in the class has been retained as it aligns with general best practices and is not contradicted by any specific rules.

[gemini-code-assist]

To maintain the immutability of the RequestContext and ensure consistency with other methods like getRelatedTasks(), it is best practice to return an unmodifiable view of the metadata map. This prevents external callers from modifying the internal state of the request parameters.

Suggested change

	public @Nullable Map<String, Object> getMetadata() {
	return params != null ? params.metadata() : null;
	}
	public @Nullable Map<String, Object> getMetadata() {
	return (params != null && params.metadata() != null) ? Collections.unmodifiableMap(params.metadata()) : null;
	}