sqlite-utils drop-table and drop-view commands

[simonw]

Would be useful to be able to drop views and tables from the CLI.

[simonw]

Docs:

• https://sqlite-utils.readthedocs.io/en/latest/cli.html#dropping-tables
• https://sqlite-utils.readthedocs.io/en/latest/cli.html#dropping-views

[simonw]

Released in 2.9 https://sqlite-utils.readthedocs.io/en/latest/changelog.html#v2-9