Add http API wrapper

[augray]

Add a wrapper of our HTTP API for the rest of the SDK to use.

Testing

In addition to the unit tests, tested with the following driver code while pointing at the dev Airtrain deployment (remember, sdk users will NOT be using this API directly; this is just to test the wrapper):

import io

import pyarrow.json as jsonl
import pyarrow.parquet as pq

from airtrain.client import client


def main() -> None:
    json_buffer = io.BytesIO()
    json_buffer.write(b'{"text": "hello"}\n')
    json_buffer.write(b'{"text": "world"}')
    json_buffer.seek(0)

    parquet_buffer = io.BytesIO()
    table = jsonl.read_json(json_buffer)
    pq.write_table(table, parquet_buffer)
    response = client().create_dataset(name="From API Client", embedding_column_name=None)

    parquet_buffer.seek(0)
    client().upload_dataset_data(response.dataset_id, parquet_buffer)

    ingest_response = client().trigger_dataset_ingest(response.dataset_id)

    print(
        f"Created dataset {response.dataset_id} "
        f"with ingest job {ingest_response.ingest_job_id}"
    )


if __name__ == "__main__":
    main()