Bump RBS parser again

Update update_testdata_exp.sh for RBS assertions

Rewrite Data to create typed attribute readers based on initialize sig

Rewrite Data to create typed attribute readers based on initialize sig

Rewrite Data to create typed attribute readers based on initialize sig

Rewrite Data to create typed attribute readers based on initialize sig

Rewrite Data to create typed attribute readers based on initialize sig

Address feedback

Rewrite Data to create typed attribute readers based on initialize sig

Rewrite Data to create typed attribute readers based on initialize sig

Update website/docs/rbs-support.md

Add note that there is not yet runtime checking for RBS signatures

Add note that there is not yet runtime checking for RBS signatures

Add note that there is not yet runtime checking for RBS signatures

Add context about interface! or abstract! (sorbet#8633)

Update cli-ref

Address feedback

Add documentation for RBS assertions

Add documentation for RBS assertions

Refactor SignatureTranslator again

WIP: cleaning

Add RBSLibraryInitializer to manage RBS's global constant pool

Add RBSLibraryInitializer to manage RBS's global constant pool

Add RBSLibraryInitializer to manage RBS's global constant pool

WIP: expand-splat

Introduce rbs::Parser to encapsulate C-level RBS parserstate

Update rbs/Parser.cc

RBS: Allow annotations on attr signatures

RBS: Allow annotations on attr signatures

Introduce rbs::Parser to encapsulate C-level RBS parserstate