[bug] CharacterLevelParserConfig gets ignored by tokenenforcer

[laurens-gs]

The following setup in the TokenEnforcer initialization cause any custom CharacterLevelParserConfigs to be overriden with default values

lm-format-enforcer/lmformatenforcer/tokenenforcer.py

Lines 55 to 56 in fe6cbf1

	config = CharacterLevelParserConfig(alphabet=tokenizer_data.tokenizer_alphabet)
	parser.config = config

I think the approach should be to directly modify the alphabet attribute of the existing config to keep other existing configurations such as max array length.

[noamgat]

Thanks for raising this. PRs welcome, if not, I will try to get to it in a few days.