Support FunC

[byakuren-hijiri]

Below is an incomplete list of tasks needed to implement the FunC support:

• Finalize, merge and release the required dependency in Tact:
  • New Func backend: First iteration tact-lang/tact#559: Introduces the FunC parser which is capable to parse about 95% of FunC grammar. We have this limitation since FunC has a context-sensitive grammar.
• Develop the FuncIR that closely is related to the FunC source code and the required functionality:
  • AST utilities
  • CFG
  • FuncIR builder
  • Common interfaces for Tact and Func IRs enabling to generalize some internal APIs
• Support multi-language projects
  • Func imports from Tact files (see: https://docs.tact-lang.org/book/import#import-func-code)
• Func tools
  • AST dump
  • CFG dump