Add python gRPC examples

[finnegancarroll]

Description

Add gRPC example code snippets for python which mirror the existing java examples.

(Additionally fixing the PyPI link in _api-reference/grpc-apis/index.md. This was pointing to most recent release, but for 3.3 it should be specifically 0.19.0.)

Testing these example code snippets by copying them into a python file and executing against a 3.3 node.
Bulk example: python grpcbulktest.py

index {
  x_index: "my-index"
  x_id {
    string: "U-HpyZkBc-tZ9EIMBNch"
  }
  x_primary_term: 1
  result: "created"
  x_seq_no: 3
  x_shards {
    successful: 1
    total: 2
  }
  x_version: 1
}

Search example: python grpcsearchtest.py

Found total_hits {
  relation: TOTAL_HITS_RELATION_EQ
  value: 4
}
 hits
total {
  total_hits {
    relation: TOTAL_HITS_RELATION_EQ
    value: 4
  }
}
hits {
  x_index: "my-index"
  x_id: "T-G-yZkBc-tZ9EIM89dJ"
  x_score {
    double: 0.047891139984130859
  }
  x_source: "{\"field\": \"value\"}"
}

Issues Resolved

Closes #11189

Version

3.3

Frontend features

If you're submitting documentation for an OpenSearch Dashboards feature, add a video that shows how a user will interact with the UI step by step. A voiceover is optional.

Checklist

• By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin.
  For more information on following Developer Certificate of Origin and signing off your commits, please check here.

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[karenyrx]

Thanks @finnegancarroll !

[finnegancarroll]

Hi @kolchfa-aws , this pr is ready for review. Thanks!

[natebower]

LGTM