Support JSON as a configuration file format

Support JSON as a configuration file format: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Right now Commitizen only reads its configuration from TOML files ( pyproject.toml / .cz.toml ). For Python projects that's fine, but I'm using Commitizen on a non-Python…