More compact bottom bar

[vanviegen]

Description

The multiline and transaction parts of the bottom bar could be rather verbose, causing (import) info not to fit when using a somewhat narrow terminal. This PR removes some verbosity, while hopefully maintaining clarity.

This PR is based on PR #1354 as it touches some of the same code.

Checklist

• I've added this contribution to the changelog.rst.
• I've added my name to the AUTHORS file (or it's already there).
• I installed pre-commit hooks (pip install pre-commit && pre-commit install), and ran black on my code.
• Please squash merge this pull request (uncheck if you'd like us to merge as multiple commits)

[j-bennet]

Hi @vanviegen ,

I see your PR's tests are failing on test_virtual_database. We have some special handling for pgbouncer database, and I suspect transactions wouldn't be supported in that, so you might need to use that check for self.is_virtual_database(). Do you need help with this PR?