[CDF-22379] Hosted Extractors Source: Kafka and Rest

[doctrino]

Description

5/5

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 89.15663% with 18 lines in your changes missing coverage. Please review.

Project coverage is 90.21%. Comparing base (6a5da4e) to head (1cfdb6c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...e/client/data_classes/hosted_extractors/sources.py	89.02%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1899      +/-   ##
==========================================
- Coverage   90.23%   90.21%   -0.03%     
==========================================
  Files         135      135              
  Lines       21405    21564     +159     
==========================================
+ Hits        19315    19453     +138     
- Misses       2090     2111      +21     

Files with missing lines	Coverage Δ
cognite/client/_version.py	100.00% <100.00%> (ø)
cognite/client/data_classes/_base.py	92.84% <100.00%> (ø)
.../client/data_classes/hosted_extractors/__init__.py	100.00% <ø> (ø)
...e/client/data_classes/hosted_extractors/sources.py	88.60% <89.02%> (+0.03%)	⬆️

... and 2 files with indirect coverage changes

[haakonvt]

LGTM, just one must-fix snake_case typo left 😄