Add ITestPlugin COM-RPC interface for test support lib

[smanes0213]

• Add ITestPlugin.h with Echo/Greet methods and @JSON annotation
• Register ID_TESTPLUGIN in QAIds.h at offset 0x060

[Copilot]

Pull request overview

Adds a new QA COM-RPC interface intended for test-support plumbing by introducing an ITestPlugin interface and allocating a new interface ID for it.

Changes:

• Add qa_interfaces/ITestPlugin.h defining ITestPlugin with Echo and Greet methods and // @json annotation.
• Extend qa_interfaces/QAIds.h with a new ID_TESTPLUGIN identifier.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
qa_interfaces/QAIds.h	Allocates a new COM-RPC interface ID (ID_TESTPLUGIN).
qa_interfaces/ITestPlugin.h	Introduces the new ITestPlugin interface surface for test support (Echo/Greet).

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

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