Add RequestContext and logging

[Nyholm]

This pull request continues the work in #104 and solves the problem in #161. Ping @Adebayo120 and @AgentSlim

We introduce a RequestContext

Motivation and Context

We want to have request specific services that only live in the context of a RequestHandlerInterface. Ie services that has access to the Session. These cannot live inside the PSR-11 Container.

PR #104 added a ClientLogger which would live next to our existing ClientGateway. To avoid adding more and more features in ReferenceHandler, I created a RequestContext which gives you access to session and request data (like metadata). The RequestContext will also build you a ClientGateway.

How Has This Been Tested?

Tested with unit test and Inspector

Breaking Changes

Yes. I have just deprecated ClientAwareInterface. I would like to remove it. Should I do it in this PR?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context