Add callback for logging message notification to client

[ihrpr]

Similar to sampling_callback, adding an ability to pass logging_callback to the client session.

Motivation and Context

There is no easy way to process Logging notifications on the client.

How Has This Been Tested?

Unit tests

Breaking Changes

NA

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

Alternatively, a single server notifications callback can be added to the client, instead of specialised callback like logging and progress notification.

[dsp-ant]

Thank you