feat(material/schematics): add option not to include animations module in ng-add

[crisbeto]

Adds a third option to the ng-add schematic that allows users to opt out of including any of the animations modules.

[devversion]

LGTM

[jelbourn]

Could we elaborate here on which components strictly require an animations module to function?

[crisbeto]

We could, but then the option will be somewhat long and the list is bound to go out of date.

[jelbourn]

I don't think the option is really useful without communicating that somehow, though. I wouldn't expect someone to go looking through the source to figure out where it's necessary, and letting someone omit animations just to then get an error when they try to use a component isn't a great experience.

[crisbeto]

I feel like that would be too much text to fit in a multi-select list in the command line. We could generate a list of components using animations from the source code and publish it as a URL on material.angular.io that we then link to from the schematic. It might take a while to do it though.

[jelbourn]

Something like that would probably be useful. I've been meaning to write an "About" page for material.angular.io for a while and a good section there would be "Animations supports"

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