Add `/models/statistics`

[haakonvt]

Adds:

• /models/statistics
• /models/statistics/spaces
• /models/statistics/spaces/byids

TODO:

• [x] docstrings
• [ ] tests
• [x] add mocks
• [ ] wait until this PR is merged: https://github.com/cognitedata/service-contracts/pull/2499

[erlendvollset]

Nice! Let's hold off on this until we publish the API though. I don't think we need to break anything, but I'm not 100% sure. Let's do a sync next week.

[haakonvt]

How pandas viz in notebooks: (could potentially be nicer? a lot is hidden in 'instances)

The other I'm pretty much happy with:

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.76%. Comparing base (ca14da8) to head (90ca0c3). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...te/client/data_classes/data_modeling/statistics.py	96.96%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2095      +/-   ##
==========================================
+ Coverage   90.73%   90.76%   +0.02%     
==========================================
  Files         164      166       +2     
  Lines       24448    24547      +99     
==========================================
+ Hits        22184    22280      +96     
- Misses       2264     2267       +3     

Files with missing lines	Coverage Δ
cognite/client/_api/data_modeling/__init__.py	100.00% <100.00%> (ø)
cognite/client/_api/data_modeling/statistics.py	100.00% <100.00%> (ø)
cognite/client/_version.py	100.00% <100.00%> (ø)
cognite/client/testing.py	100.00% <100.00%> (ø)
...te/client/data_classes/data_modeling/statistics.py	96.96% <96.96%> (ø)

... and 1 file with indirect coverage changes

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[doctrino]

/gemini review

[doctrino]

/gemini review

[doctrino]

/gemini review

[doctrino]

/gemini review

[erlendvollset]

🦄