[fonts] Migrate all packages + tests to new build rules

Migrate to new templates and break up complex package
declarations into multiple components.

Test: fx test //src/fonts
Change-Id: Iafd24935ab879133b9684f955646cf56168e7999
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/481488
Commit-Queue: Dave Smith <smithdave@google.com>
Reviewed-by: Konstantin Pozin <kpozin@google.com>
Reviewed-by: Shai Barack <shayba@google.com>