feat: adds new feature Fhir.es_sql()

[shawnzhu]

This will invoke the OpenSearch SQL that supports:

1. prepared statement - so that it could inject parameters via params. see test case
2. pagination via LIMIT {offset},{page_size} - so it doesn't need scroll_id.
3. resultset could be transfromed to dataframe directly. for instance:

df = fhir.es_sql(
    project_id='xxx',
    statement='SELECT id, subject FROM diagnostic_report WHERE identifier.system = ? LIMIT 10',
    params=[{
      "type": "string",
      "value": "example-identifier-system"
    }]
).get_as_dataframe('datarows')

[epeters3]

Looks good, nice addition. I think the existing sql and execute_sql methods don't even work anymore. It would be nice to remove them, except there could be some edge case and some customer that's still using them in their notebooks.

[epeters3]

@shawnzhu if you want this change to be published in a new version of the package, I think you need to manually update the package version in pyproject.toml. See https://github.com/lifeomic/phc-sdk-py/blob/master/CONTRIBUTING.md