chore(focus-trap): move template to a separate file

[crisbeto]

Moves the focus trap to a separate file, as per a TODO.

[jelbourn]

@crisbeto does gulp build:release work with this change? I remember there being some reason that the separate template file didn't work for anything in core. (Without I should have written in that comment...)

[crisbeto]

Seems like it does - it didn't throw any errors and the template gets inlined in the dist/@angular/material/material.umd.js, as well as dist/@angular/material/core/a11y/focus-trap.js. Is there anywhere else I should be looking at?

[jelbourn]

I guess it's fine, then

LGTM

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