feat: DRAFT deprecation warning for Vision API

[mallpunk]

Added deprecation warning for Vision API.

The link is a placeholder for now, will be updated to point to the deprecation notice on docs.cognite.com when it has been published. This PR should not be merged until the deprecation has been published and the link updated.

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[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.84%. Comparing base (e2f06c0) to head (0a9efc6).

Files with missing lines	Patch %	Lines
cognite/client/_api/vision.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2469      +/-   ##
==========================================
- Coverage   48.86%   48.84%   -0.02%     
==========================================
  Files         191      191              
  Lines       26152    26157       +5     
==========================================
- Hits        12778    12777       -1     
- Misses      13374    13380       +6     

Files with missing lines	Coverage Δ
cognite/client/_api/vision.py	56.09% <60.00%> (+0.54%)	⬆️

... and 2 files with indirect coverage changes

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