feat: disable grpc response compression

[jansimonb]

Proposed Changes

Adds functionality to disable gRPC response compression for Flight queries in the InfluxDB3 C# client.

• Adds DisableGrpcCompression property to QueryOptions class
• Adds INFLUX_DISABLE_GRPC_COMPRESSION environment variable support
• Adds disableGrpcCompression connection string parameter support
• Logs a warning if both DisableGrpcCompression and CompressionProviders are set (DisableGrpcCompression takes priority)

Testing

• Unit tests
• Integration tests verify grpc-accept-encoding request and grpc-encoding response headers
• 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)

[bednar]

LGTM 🚀