Add support for args/params for extraCredentials to be passed via headers to trino

[matt12eagles]

Add support for args/params for extraCredentials to be passed via headers to trino

Thinking this link may be of use:

https://github.com/dropbox/PyHive/issues/311#issuecomment-586828649

[mapshen]

+1 on this. It would be even better if we can pass in arbitrary headers. For our use case, the Host header is needed.

[dungdm93]

Hello @matt12eagles, @mapshen Did you try:

engine = create_engine(...,
   connect_args=dict(
    http_headers={
      'X-Presto-Extra-Credential': f"access-token={ACCESS_TOKEN}"
    },
  )
)
``

[mapshen]

@dungdm93 I can confirm this setting does take effect - is there a doc on the args users can pass into connect_args?