Allow chain/chain_id to take str/int and convert to int

[cjber]

Adds a normalization function that converts strings to int, and removes quotes. Also less strict type checking, allowing str/int.

[jakeloo]

was wondering if we should just keep it simple by regexp digits or just throw if chain_id is not is_digit?

[cjber]

I think regex to extract makes sense, to avoid other edge cases where the model may do something like "Chain ID: 1". It does make sense to throw then is_digit = False, but I think for something like this it might be best to just post process the llm outputs a little.