Issue title: how to switch connect info
 Issue body: 1. Which driver are you using and version of it (Ex: PostgreSQL 10.0):
MYSQL
2. Which TablePlus build number are you using (the number on the welcome screen, Ex: build 81):
2.9.1(264)
3. The steps to reproduce this issue:
How to connect other database addresses under the current connection? (I have 2 connection addresses for dev)
Noted: If the bug is related to data, please attach an example SQL data.

 Comments: 
 Comment 0: You can do it by pressing Command + P or Command + K.
{'source': 'GithubIssues', 'repo_name_with_owner': 'TablePlus/TablePlus', 'issue_id': 508876417, 'repo_stars': 2958.0}