* Use separate Cargo.lock for tools/runtime-codegen

* Create separate workspace for tools/runtime-codegen

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.49 to 1.0.51.
- [Release notes](https://github.com/dtolnay/proc-macro2/releases)
- [Commits](https://github.com/dtolnay/proc-macro2/compare/1.0.49...1.0.51)

---
updated-dependencies:
- dependency-name: proc-macro2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

* Create CLI tool for generating indirect runtimes code

* Use the generated runtime for rialto parachain

* Avoid autogenerated files when executing cargo spellcheck

* Fix clippy warning