docs: add all __call__ methods

[MortGron]

Description

Add all of the call methods to the documentation

Example:

Checklist:

• Tests added/updated.
• Documentation updated. Documentation is generated from docstrings - these must be updated according to your change.
  If a new method has been added it should be referenced in cognite.rst in order to generate docs based on its docstring.
• The PR title follows the Conventional Commit spec.

[gemini-code-assist]

Code Review

This pull request updates the documentation generation logic to include __call__ methods for various SDK resources, allowing them to be properly documented in the API reference. Key changes include modifications to the autosummary extension and templates, as well as adding descriptive headings for these methods across numerous client modules. Feedback identifies a potential duplication of the __call__ method in the generated documentation and highlights several instances of inconsistent capitalization in the resource descriptions that should be corrected for consistency.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.07%. Comparing base (3326f55) to head (891783c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2633      +/-   ##
==========================================
- Coverage   93.10%   93.07%   -0.03%     
==========================================
  Files         486      486              
  Lines       49633    49633              
==========================================
- Hits        46210    46196      -14     
- Misses       3423     3437      +14     

Files with missing lines	Coverage Δ
cognite/client/_api/datapoints.py	98.50% <ø> (ø)
cognite/client/_sync_api/datapoints.py	100.00% <ø> (ø)

... and 3 files with indirect coverage changes

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