crude ocr endpoint implementation on diagrams/ocr

[olacognite]

Description

Implements the newest OCR endpoint, only in azure dev at time of writing, so WIP

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.
• Changelog updated in CHANGELOG.md.
• Version bumped. If triggering a new release is desired, bump the version number in _version.py and pyproject.toml per semantic versioning.

[codecov]

Codecov Report

Attention: Patch coverage is 17.39130% with 19 lines in your changes missing coverage. Please review.

Project coverage is 90.64%. Comparing base (8a8ed12) to head (927ff54).

Files with missing lines	Patch %	Lines
cognite/client/_api/diagrams.py	17.39%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1580      +/-   ##
==========================================
- Coverage   90.72%   90.64%   -0.09%     
==========================================
  Files         130      130              
  Lines       20139    20162      +23     
==========================================
+ Hits        18272    18275       +3     
- Misses       1867     1887      +20     

Files with missing lines	Coverage Δ
cognite/client/_api/diagrams.py	72.03% <17.39%> (-13.23%)	⬇️

... and 1 file with indirect coverage changes