Support for custom HTTP headers

[llamafilm]

Our Trino cluster requires JWT authentication which can be sent as an HTTP header in the form of Authorization: Bearer $TOKEN. The Trino datasource settings page shows a button to add custom HTTP headers, but when I try that it fails:

grafana | logger=context userId=1 orgId=1 uname=admin t=2024-09-06T19:33:34.510609046Z level=error msg=InternalError error="[plugin.downstreamError] client: failed to query data: Failed to query data: rpc error: code = Unknown desc = error reading settings: Custom headers are not supported and must be not set" remote_addr=xxxxxxxxx traceID=

It would be awesome to get this feature added, as it's the only way my company allows external Trino access.