Issue title: Add reflection table for Steampipe connections
 Issue body: **Is your feature request related to a problem? Please describe.**
I'd like to be able to get my connection information from tables to use in queries that rely on this information.

**Describe the solution you'd like**
A table or set of tables that contain my current connection information.

**Describe alternatives you've considered**
None at the moment.

**Additional context**
Add any other context or screenshots about the feature request here.

 Comments: 
 Comment 0: this has been [implemented](https://github.com/turbot/steampipe/tree/add_reflection_table_for_Steampipe_connections_505) 

However more work is needed on potentially parsing the connection config before insertion
 Comment 1: instead, connection information can be injected into the _ctx column
{'source': 'GithubIssues', 'repo_name_with_owner': 'turbot/steampipe', 'issue_id': 900207006, 'repo_stars': 3678.0}