Add notlike table filter

[simonw]

I found myself wanting that for applying the opposite of this: https://github-to-sqlite.dogsheep.net/github/dependent_repos?dependent__like=%25simonw%2F%25&_sort_desc=dependent_stars

[simonw]

So that I can do this: https://github-to-sqlite.dogsheep.net/github/dependent_repos?_where=dependent%20not%20like%20%27%simonw/%%27

[simonw]

[simonw]

Demo: https://latest.datasette.io/fixtures/roadside_attractions?name__notlike=%25museum%25

Docs: https://datasette.readthedocs.io/en/latest/json_api.html#column-filter-arguments