Add skeleton for AstFactory mode to add colors instead of JSTypes
Add skeleton for AstFactory mode to add colors instead of JSTypes

For now, all the methods adding JSTypes in some way will crash in colors-mode.

PiperOrigin-RevId: 384971124

ChadKillingsworth/closure-compiler,google/closure-compiler,google/closure-compiler,nawawi/closure-compiler,google/closure-compiler,monetate/closure-compiler,ChadKillingsworth/closure-compiler,nawawi/closure-compiler,nawawi/closure-compiler,ChadKillingsworth/closure-compiler,nawawi/closure-compiler,monetate/closure-compiler,monetate/closure-compiler,monetate/closure-compiler,ChadKillingsworth/closure-compiler,google/closure-compiler