feat: Add message creation methods with contextId and taskId support

[Asymtode712]

PR Description

• Added new message creation methods to A2A.java (createUserMessage, createAgentMessage, createMessage)

• Implemented support for configuring contextId, taskId, parts, metadata, and referenceTaskIds

• Added comprehensive test cases in A2ATest.java to verify functionality

• Methods follow similar pattern to the Python implementation for consistency across SDKs

• Follow the CONTRIBUTING Guide.

• Ensure the tests pass

Fixes #302 🦕

[gemini-code-assist]

Summary of Changes

Hello @Asymtode712, 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 significantly enhances the message creation capabilities within the A2A Java SDK. It introduces new, more configurable methods for creating user and agent messages, allowing developers to specify additional attributes like context and task identifiers, custom message parts, and metadata. This update aims to provide a more robust and consistent API experience, mirroring the functionality available in the Python SDK, and is backed by thorough unit tests to ensure reliability.

Highlights

• New Message Creation Methods: Introduced createUserMessage, createAgentMessage, and a general createMessage method in A2A.java to offer more flexible message construction.
• Enhanced Message Configuration: The new methods support configuring contextId, taskId, custom parts, metadata, and referenceTaskIds for messages.
• Consistency with Python SDK: The new message creation patterns align with the existing Python implementation, ensuring consistency across SDKs.
• Comprehensive Test Coverage: Added a new test file A2ATest.java with extensive test cases to verify the functionality of all new message creation methods and their various configuration options.

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[Asymtode712]

@kabir @fjuma please review this PR

[gemini-code-assist]

Code Review

This pull request introduces new factory methods in A2A.java for creating Message objects with extended options like contextId, taskId, and custom parts. The changes are well-structured and follow the existing pattern of the class. Comprehensive unit tests have been added in A2ATest.java to cover the new functionality. My review includes a couple of suggestions for code simplification and improving documentation clarity in the new createMessage method.

[fjuma]

@Asymtode712 Thanks for the PR! I've added some comments on it. Feel free to let us know if you have any questions.

[Asymtode712]

@fjuma done with the changes, pls review

[fjuma]

Thanks @Asymtode712!