Breaking Change (changelog note):

Connections to workspaces (via SSH, workspace apps, or browser port-forwarding) will no longer create entries in the audit log. Those events will now be included in the 'Connection Log'.
Please see the 'Connection Log' page in the dashboard, and the Connection Log documentation for details. Those with permission to view the Audit Log will also be able to view the Connection Log. The new Connection Log has the same licensing restrictions as the Audit Log, and requires a Premium Coder deployment.

Context

This is the first PR of a few for moving connection events out of the audit log, and into a new database table and web UI page called the 'Connection Log'.

This PR:

• Creates the new table
• Adds and tests queries for inserting and reading, including reading with an RBAC filter.
• Implements the corresponding RBAC changes, such that anyone who can view the audit log can read from the table
• Implements, under the enterprise package, a ConnectionLogger abstraction to replace the Auditor abstraction for these logs. (No-op'd in AGPL, like the Auditor)
• Routes SSH connection and Workspace App events into the new ConnectionLogger
• Updates all existing tests to check the values of the ConnectionLogger instead of the Auditor.

Future PRs:

• Add filtering to the query
• Add an enterprise endpoint to query the new table
• Write a query to delete old events from the audit log, call it from dbpurge.
• Implement a table in the Web UI for viewing connection logs.