Introduce a new Builtin that takes a language code and returns the corresponding Language object ZID.
Returns an error if the language code does not match to anything.
Signature: Z6 -> Z60
Suggested ZID: Z860 (Because Z60 is language)
- Add new definition to function-schemata for Z860 and Z960.
- Add built-in implementation of Z960 to function-orchestrator and wire up for Z860 requests.