Create a "Toolchain" API surface

This creates a new API surface for the APIs provided by ART to compile
other API domains (e.g. this contains LambdaMetaFactory). The scope of
this API surface is restricted to compile-time. Unlike the other API
surfaces (e.g. public) whose APIs will exist on device in the form of
implementation libraries, these classes are not guaranteed to exist on
device.

This also updates the naming convention map used in Multi-tree API
export

Bug: 261244752
Test: TH
Change-Id: I164714d68618a3c289bac1a695958e36fdbbda5d