Epic: Connections Pane - Release candidate

[dfalbel]

This a aspirational list of issues that we want to address before the release canditate.
See Sub-Issues for more concrete planned work.

Backlog:

• connection_open() could show more information in the display name rstudio/connections#18 (cc @gadenbuie )
• Mark R objects with the a db icon in the Variables pane, so you can from the Variables pane to the Connections pane
• Support for Python Databricks SQL connector
• Support for Snowflake Python Connector
• Usage of Workbench connections eg see here
• Suport for connection "actions" as in the contract
• Look at support for polars
• Look at support in Ibis
• Display the 'Connection type' somewhere in the UI