feat(DatapointsAPI): Add missing 'type' field to Datapoints[Array] data classes

[haakonvt]

Since we have not released v8 yet, we have a golden opportunity to implement necessary changes just-in-time for release.

Changes

1. Update protobuf files
2. Update Datapoints and DatapointsArray to respect required fields
3. Add the new field 'type' as required

[codecov]

Codecov Report

❌ Patch coverage is 84.44444% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.62%. Comparing base (b93f588) to head (b78ec1e).
⚠️ Report is 4 commits behind head on pysdk-release-v8.

Files with missing lines	Patch %	Lines
cognite/client/utils/_datapoints.py	36.36%	7 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           pysdk-release-v8    #2484   +/-   ##
=================================================
  Coverage             64.61%   64.62%           
=================================================
  Files                   467      467           
  Lines                 47778    47792   +14     
=================================================
+ Hits                  30873    30884   +11     
- Misses                16905    16908    +3     

Files with missing lines	Coverage Δ
...ognite/client/data_classes/datapoint_aggregates.py	0.00% <ø> (ø)
cognite/client/data_classes/datapoints.py	58.17% <100.00%> (+0.81%)	⬆️
...te/client/data_classes/datapoints_subscriptions.py	33.33% <ø> (ø)
...ests/tests_integration/test_api/test_datapoints.py	99.30% <100.00%> (ø)
...integration/test_api/test_synthetic_time_series.py	85.56% <ø> (ø)
tests/tests_unit/test_api/test_datapoints.py	100.00% <100.00%> (ø)
.../tests_unit/test_api/test_synthetic_time_series.py	96.25% <100.00%> (ø)
...ts/tests_unit/test_data_classes/test_datapoints.py	100.00% <ø> (ø)
tests/tests_unit/test_data_classes/test_repr.py	100.00% <100.00%> (ø)
...s/tests_unit/test_data_classes/test_time_series.py	90.69% <ø> (ø)
... and 1 more

... and 1 file with indirect coverage changes

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[haakonvt]

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