Fetch `tables()` on demand in the UI and autocomplete

[insmac]

The current application logic fetches the table list on boot and refreshes the result set in certain situations (i.e. after a DDL type query). This is fine, unless the user has a lot of tables in the database (1000+), in which case the application can become unstable or stop working altogether.

To fix the problem, the tables() query has to be paginated. There is a number of things that have to be done in the application logic:

• Add method to fetch tables with LIMIT or WHERE filter
• LIMIT for table listing
• WHERE for FIlter search bar
• Refactor Tables UI to paginate table results
• Refactor Filter search bar to use SQL filter when searching
• Refactor Create Table to use search on demand when validating if a given table name exists already
• WHERE for checking table existence in Import CSV