feat(drawer): add feature targeting for styles

[crisbeto]

Adds support for feature targeting to the mdc-drawer styles.

Relates to #4227.

[crisbeto]

Here's the output before and after these changes. A few lines got moved around, but it shouldn't make a difference.

before.css.txt
after.css.txt

[abhiomkar]

Looks good overall, minor comments.

[crisbeto]

Reworked based on the feedback @abhiomkar.

[abhiomkar]

LGTM.

[codecov-io]

Codecov Report

Merging #4877 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4877   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files         119      119           
  Lines        5650     5650           
  Branches      749      749           
=======================================
  Hits         5603     5603           
  Misses         46       46           
  Partials        1        1

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