PlutusTx as a separate backend

[bladyjoker]

Tackles #197 https://github.com/mlabs-haskell/lambda-buffers/issues/221

DONE

• Misc:
  • Refactored Codegen and make the relationship between different components clearer
  • Added extras/dev-shells where the dev-prelude|plutus-haskell shells are
• Separates PlutusTx:
  • Its own lbf-plutus-to-plutustx CLI
  • Its own lbfPlutusTx Nix function
  • Its own lbr-plutustx
  • Complete test suite that RUNS the compiled scripts
• Plutarch testsuite
  • Complete test suite
• LB Plutus
  • Removed Plutus.V1.Todo and PlutusV2.Todo
  • Did some codegen config cleanup and aligned them all a bit better (there were duplicates and missing stuff)
  • Purescript
  • Made a LambdaBuffers.Runtime.Plutus.NotImplemented type and mapped all currently not implemented Opaques there

TODO

• (DONE) Typescript
  • (DONE) Scaffolded the required changes but compilation fails because some types are missing (https://github.com/mlabs-haskell/plutus-ledger-api-typescript/issues/12)
  • (DONE) Complete the testsuite
  • Purescript
    • Implement missing types and instances
    • Complete the testsuite