CollectionService/DatasetService tests

[das-Abroxas]

Features

This adds tests for the CollectionService / DatasetService function implementations:

• create_collection / dataset
• get_collection / dataset
• get_collections / datasets
• delete_collection / dataset
• update_collection_name / dataset_name
• update_collection_description / dataset_description
• update_collection_key_values / dataset_key_values
• update_collection_data_class / dataset_data_class
• snapshot_collection /dataset

[codecov]

Codecov Report

Patch coverage: 57.89% and project coverage change: +3.27% 🎉

Comparison is base (6e88245) 41.51% compared to head (566f2b2) 44.78%.
Report is 3 commits behind head on feat/version2.0rework.

❗ Current head 566f2b2 differs from pull request most recent head 288c556. Consider uploading reports for the commit 288c556 to get more accurate results

Additional details and impacted files

@@                    Coverage Diff                    @@
##           feat/version2.0rework     #119      +/-   ##
=========================================================
+ Coverage                  41.51%   44.78%   +3.27%     
=========================================================
  Files                         66       66              
  Lines                       9380     9384       +4     
=========================================================
+ Hits                        3894     4203     +309     
+ Misses                      5486     5181     -305     

Files Changed	Coverage Δ
src/caching/notifications_handler.rs	0.00% <0.00%> (ø)
src/grpc/datasets.rs	0.00% <0.00%> (ø)
src/grpc/object.rs	0.00% <0.00%> (ø)
src/grpc/relations.rs	0.00% <0.00%> (ø)
src/grpc/workspaces.rs	0.00% <0.00%> (ø)
src/middlelayer/hooks_db_handler.rs	22.18% <0.00%> (+1.50%)	⬆️
src/middlelayer/hooks_request_types.rs	0.00% <0.00%> (ø)
src/middlelayer/token_db_handler.rs	0.00% <0.00%> (ø)
src/caching/cache.rs	72.36% <100.00%> (+0.22%)	⬆️
src/database/dsls/object_dsl.rs	85.44% <100.00%> (+0.80%)	⬆️
... and 7 more

... and 9 files with indirect coverage changes

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