Introduce WeaviateAsyncClient as async alternative to WeaviateClient

[tsmith023]

• Changes base implementation to be purely async using httpx and grpclib(instead of google's grpc due to issues)
• Uses base implementation in WeaviateAsyncClient directly
• A class decorator pattern wraps the async implementation in the sync routes replication the arguments and docstrings automagically @dirkkul
• Replace WeaviateClient internal calls with event-loop-wrapped blocking calls using the base async implementation
• An event loop thread is spun up by the client at instantiation as a global singleton that is used in all calls
• client.batch is only available on the WeaviateClient object, since it is a purely sync algorithm. It depends on the new higher-level event loop thread

[weaviate-git-bot]

Great to see you again! Thanks for the contribution.

beep boop - the Weaviate bot 👋🤖

PS:
Are you already a member of the Weaviate Slack channel?

[rolandgvc]

I'm following this as well. I'm looking forward to the async client :)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.21184% with 125 lines in your changes are missing coverage. Please review.

Project coverage is 94.12%. Comparing base (9fa261f) to head (5617f76).
Report is 26 commits behind head on main.

Files	Patch %	Lines
weaviate/client.py	83.70%	22 Missing ⚠️
weaviate/collections/collection/async_.py	74.02%	20 Missing ⚠️
weaviate/collections/iterator.py	78.26%	10 Missing ⚠️
weaviate/event_loop.py	82.45%	10 Missing ⚠️
weaviate/connect/v4.py	91.26%	9 Missing ⚠️
integration/conftest.py	79.41%	7 Missing ⚠️
weaviate/collections/collections/async_.py	87.75%	6 Missing ⚠️
weaviate/collections/collection/sync.py	86.48%	5 Missing ⚠️
weaviate/connect/authentication_async.py	95.40%	4 Missing ⚠️
weaviate/collections/aggregations/base.py	83.33%	3 Missing ⚠️
... and 20 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1007      +/-   ##
==========================================
- Coverage   94.56%   94.12%   -0.45%     
==========================================
  Files         181      200      +19     
  Lines       18825    19492     +667     
==========================================
+ Hits        17802    18346     +544     
- Misses       1023     1146     +123     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.