Allow unknown in read format of groups

[doctrino]

Description

• For Group and GroupList set allow_unkown=True
• While keep GroupWrite and GroupWriteList allow_unknown=False

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[bot]]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.06%. Comparing base (a661630) to head (3f3a725).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1865 +/- ## ======================================= Coverage 91.06% 91.06% ======================================= Files 124 124 Lines 19247 19262 +15 ======================================= + Hits 17527 17541 +14 - Misses 1720 1721 +1 ``` | [Files](https://app.codecov.io/gh/cognitedata/cognite-sdk-python/pull/1865?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cognitedata) | Coverage Δ | | |---|---|---| | [cognite/client/\_version.py](https://app.codecov.io/gh/cognitedata/cognite-sdk-python/pull/1865?src=pr&el=tree&filepath=cognite%2Fclient%2F_version.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cognitedata#diff-Y29nbml0ZS9jbGllbnQvX3ZlcnNpb24ucHk=) | `100.00% <100.00%> (ø)` | | | [cognite/client/\_api/iam.py](https://app.codecov.io/gh/cognitedata/cognite-sdk-python/pull/1865?src=pr&el=tree&filepath=cognite%2Fclient%2F_api%2Fiam.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cognitedata#diff-Y29nbml0ZS9jbGllbnQvX2FwaS9pYW0ucHk=) | `94.33% <92.85%> (-0.22%)` | :arrow_down: | | [cognite/client/data\_classes/iam.py](https://app.codecov.io/gh/cognitedata/cognite-sdk-python/pull/1865?src=pr&el=tree&filepath=cognite%2Fclient%2Fdata_classes%2Fiam.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cognitedata#diff-Y29nbml0ZS9jbGllbnQvZGF0YV9jbGFzc2VzL2lhbS5weQ==) | `95.51% <75.00%> (-0.57%)` | :arrow_down: | ... and [3 files with indirect coverage changes](https://app.codecov.io/gh/cognitedata/cognite-sdk-python/pull/1865/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cognitedata)