Allow to create a time-series collection from create database.

Merge `compass-collections-ddl` and `compass-databases-ddl` in one package exposing the 2 plugins (similar to import / export).

In dev mode, allow to pick which screen to show with a link.

Also the create collection dialog and database form should be implemented as in: https://www.figma.com/file/87zPLdTixQ82B3fK4Fb6YG/Compass?node-id=402%3A6212

An example of implementation of the form is here: https://github.com/mongodb-js/compass/pull/2216/files