Scaffold Union TypeScript SDK v2 (#4053)

- **feat(ts-sdk): init**
- **feat(ts-sdk): scaffold**
- **chore(ts-sdk): build with nix**
- **chore(ts-sdk): configure tests**
- **feat(ts-sdk): run tests in nix**
- **fix(ts-sdk): reproducibly publish sdk**
- **docs(ts-sdk): document how to build, publish, edit**
- **feat(ts-sdk): publish ucs03abi**
- **feat(tssdk): first version**
- **fix(ts-sdk): simplify**
- **feat(ts-sdk): first proper publish**
- **chore(ts-sdk): cleanup**
- **chore(ts-sdk): cleanup**