resourceloader: Add minified version of mw.loader.implement() wrapper

resourceloader: Add minified version of mw.loader.implement() wrapper

Follows-up b7eb243d92, which changed minification to be per-module,
but had as result that the little implement() wrapper is not always
minified, e.g. when outputting modules that have minification disabled
(such as 'user.tokens' and 'user.options').

Rather than introducing some complex minification cache for the
wrapper (with a find and replace for the variable content), simply
add a hardcoded minified version of the wrapper.

Change-Id: Iccf0d3408beab4387031cc55689394ff67e1e64b