docs(data modelling): Add data modelling data types to the docs

[MortGron]

Description

There are many references to the data modelling data types classes in the docs, but they have not been documented. Now they are included.

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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.05%. Comparing base (8f0c3e3) to head (5813eee).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2637      +/-   ##
==========================================
- Coverage   93.05%   93.05%   -0.01%     
==========================================
  Files         486      486              
  Lines       49671    49671              
==========================================
- Hits        46221    46219       -2     
- Misses       3450     3452       +2     

Files with missing lines	Coverage Δ
cognite/client/_api/diagrams.py	84.26% <ø> (ø)
cognite/client/_sync_api/diagrams.py	91.30% <ø> (ø)

... and 4 files with indirect coverage changes

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[gemini-code-assist]

Code Review

This pull request updates the documentation references for FileReference in the diagrams API and adds documentation for data modeling data types. The review feedback points out that referencing contextualization.FileReference directly in the docstrings of DiagramsAPI.detect and SyncDiagramsAPI.detect will cause Sphinx build failures because the contextualization module is not imported in those files. It is recommended to use the fully qualified path cognite.client.data_classes.contextualization.FileReference instead.