add library mode support to audio extraction

[edknv]

Description

This PR enables library mode with audio extraction.

from nv_ingest.util.pipeline.pipeline_runners import PipelineCreationSchema

config = PipelineCreationSchema(
    audio_grpc_endpoint="grpc.nvcf.nvidia.com:443",
    audio_function_id="<redacted>",
)

pipeline_process = start_pipeline_subprocess(config)

client = NvIngestClient(
    message_client_allocator=SimpleClient,
    message_client_port=7671,
    message_client_hostname="localhost"
)

ingestor = (
    Ingestor(client=client)
    .files("/work/data/audio/*.wav")
    .extract(
        extract_method="audio",
    )
)

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.
• If adjusting docker-compose.yaml environment variables have you ensured those are mimicked in the Helm values.yaml file.