feat: disable grpc response compression

[jansimonb]

Proposed Changes

Add option to disable gRPC response compression for Flight queries:

• disable_grpc_compression parameter in InfluxDBClient3 constructor
• INFLUX_DISABLE_GRPC_COMPRESSION environment variable support in from_env()

Testing

• Unit tests added
• Integration test added that checks the request/response headers of the grpc communication to verify that the returned query response is really compressed. To achieve this a lightweight HTTP/2 proxy had to be added for testing purposes (h2_proxy.py).
• NOTE: InfluxDB 3 Core may not compress responses even when client advertises gzip support. Per gRPC spec, servers may choose not to compress regardless of client settings. InfluxDB Cloud typically compresses, but Core may not. For that reason it is recommended to run the integration test also against InfluxDB Cloud.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.05%. Comparing base (fac1793) to head (7bf88f7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #179      +/-   ##
==========================================
+ Coverage   69.73%   70.05%   +0.32%     
==========================================
  Files          35       35              
  Lines        2333     2348      +15     
==========================================
+ Hits         1627     1645      +18     
+ Misses        706      703       -3     

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[bednar]

LGTM 🚀