Update Compose typography API for Variable Emphasized

Align with current Compose M3 API that introduces Variable Emphasized
text tokens (GSF-emphasized styles).

This allows for system surfaces implemented in Compose to use the new
GSF-emphasized font styles. This is also the most performant method of
rendering the font in Compose since it directly access the font styles
that are created at system server boot time.

Flag: EXEMPT internal Compose API update
Bug: 397759091
Test: manual
Change-Id: I58a0c41d02dadeac2b4c0717f0e1c9f3fa929534