Additional props for grpc

[dirkkul]

Adds:

• a dataclass for additional properties
• support for grpc with that dataclass, strings are not supported

The results for grpc and graphql should be identical

Usage:

query = client.query.get("Test").with_additional(
            weaviate.AdditionalProperties(
                uuid=True,
                vector=True,
                creationTimeUnix=True,
                lastUpdateTimeUnix=True,
                distance=True,
            )
        )

[codecov-commenter]

Codecov Report

Patch coverage: 87.73% and project coverage change: -0.24 ⚠️

Comparison is base (df41164) 95.99% compared to head (eea1ddd) 95.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
- Coverage   95.99%   95.75%   -0.24%     
==========================================
  Files          64       64              
  Lines        7544     7759     +215     
==========================================
+ Hits         7242     7430     +188     
- Misses        302      329      +27     

Impacted Files	Coverage Δ
weaviate_grpc/weaviate_pb2.py	26.82% <3.57%> (-13.92%)	⬇️
weaviate/exceptions.py	91.42% <60.00%> (-5.35%)	⬇️
weaviate/auth.py	92.50% <80.00%> (-7.50%)	⬇️
weaviate/backup/backup.py	98.14% <83.33%> (-1.86%)	⬇️
weaviate/gql/get.py	97.17% <92.04%> (-1.57%)	⬇️
weaviate/connect/authentication.py	96.00% <94.44%> (+0.47%)	⬆️
weaviate/client.py	98.66% <96.00%> (+0.11%)	⬆️
weaviate/util.py	95.83% <96.15%> (-0.08%)	⬇️
integration/test_grcp.py	98.27% <96.77%> (+0.97%)	⬆️
integration/test_cluster.py	100.00% <100.00%> (ø)
... and 12 more

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