feat(gcp_cloud_storage sink): add Parquet encoder

[sonnens]

Summary

Adds parquet batch encoder support to the google_cloud_storage sink similar to the aws_s3 sink

Vector configuration

sinks:
  gcs_parquet:
    type: gcp_cloud_storage
    inputs:
      - enforce_schema
    bucket: vector-parquet-test-bucket
    key_prefix: "date=%F/"
    encoding:
      codec: text
    batch_encoding:
      codec: parquet
      schema_file: test.schema
      compression: snappy
      schema_mode: strict

How did you test this PR?

Change Type

• Bug fix
• New feature
• Dependencies
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

#25156

[chatgpt-codex-connector]

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