Package dependencies

[saulfield]

This PR makes progress towards #1981.

Number of dependencies for a base install of smarts with no extras (before -> after):

• Required packages: 24 -> 17
• Total installed packages: 57 -> 28

An [all] extra has been added which installs all extras. A CI test to check that the [all] install succeeds with no conflicts has also been added.

Removed

• pandas
• rich
• sh

Moved out of core

• tornado
• websocket-client
• ijson
• matplotlib