Add ability to assign multiple server capabilities to a server

[rimashah25]

I'm submitting a ...

new feature / enhancement request

This Feature Request affects these Traffic Control components:

• Traffic Ops
• Traffic Portal
• Documentation

Current behavior:

There is no way to apply multiple server capabilities to a server at a time (in the UI or the API). Using the API is a lot faster than using the UI to mass-assign server capabilities, but it would be much easier if both the API and UI supported the ability to assign multiple server capabilities to one server at a time.

New behavior:

Add the ability to mass-assign (and mass-remove) server capabilities to one server at a time. This should probably be a new TO API route.
When in Traffic Portal, going to Configure > Servers > More > Manage Capabilities > Assign Multiple Capabilities, should be similar to how DS-server assignments are handled in TP (i.e. Services > Delivery Services > select delivery service > More > Manage servers > More > Assign servers.
That way you can type in the search bar to filter across all fields would be similarly useful in the case of mass-applying server capabilities.

Minimal reproduction of the problem with instructions:
Configure > Servers > select server > More > manage capabilities > +