Improve client documentation

[jlowin]

No description provided.

[Copilot]

Pull Request Overview

This PR improves the client documentation and makes minor code adjustments to align parameter naming for log handling. Key changes include:

• Renaming a parameter in tests for clarity.
• Refactoring the logging type alias and callback usage.
• Updating documentation by adding a new features page and revising the client usage guide.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/client/test_logs.py	Renamed parameter in handle_log for improved clarity.
src/fastmcp/client/logging.py	Refactored logging type alias and added create_log_callback for better API design.
src/fastmcp/client/client.py	Updated logging callback setup to leverage create_log_callback.
docs/docs.json	Added a new documentation page reference under Clients.
docs/clients/features.mdx	Introduced an advanced features documentation page detailing new capabilities.
docs/clients/client.mdx	Revised the client documentation structure and removed some outdated sections.

Comments suppressed due to low confidence (2)

tests/client/test_logs.py:12

• The renaming from 'params' to 'message' improves clarity; please verify that all call sites and related documentation have been updated accordingly.

async def handle_log(self, message: LogMessage) -> None:

docs/clients/client.mdx:264

• [nitpick] The removal of sections covering progress tracking, LLM sampling, and logging examples may leave gaps; please ensure that essential guidance for these features remains accessible to users.

#### Error Handling