Introduce Config type for adkrest

[Kenasvarghese]

This PR introduces a Config type in the adkrest package to define session, artifact, and agent dependencies.

As a follow-up to #415, adkrest should not directly depend on launcher.Config. Defining a package-local configuration type provides a clearer and more appropriate abstraction for REST integration.

Related issue: #418

[gemini-code-assist[bot]]

Summary of Changes

Hello @Kenasvarghese, I'm Gemini Code Assist[^1]! 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 refactors the configuration management within the adkrest package by introducing a dedicated Config type. This change aims to improve modularity and reduce tight coupling by ensuring the adkrest package manages its own dependencies (session, artifact, agent services) through a specific interface, rather than relying on a broader launcher.Config.

Highlights

• New Configuration Type: Introduced a new Config type within the adkrest package to explicitly define its required dependencies, such as session, artifact, and agent services.
• Dependency Decoupling: Decoupled the adkrest package from directly depending on launcher.Config, addressing a follow-up from issue #415.
• Improved Abstraction: The new package-local Config type provides a clearer and more appropriate abstraction for managing dependencies specific to REST integration.

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[IAmSurajBobade]

@Kenasvarghese can you fix adkrest example. https://github.com/google/adk-go/blob/main/examples/rest/main.go#L69

[Kenasvarghese]

Please Review @IAmSurajBobade

[Kenasvarghese]

/gemini review