[feature request] Checking type of default values

[WeberJulian]

I think it would be great if coqpit checked the type of default parameters.
In this commit, we fix a problem we had with coqui-TTS, where the value inside of the config was silently set to 0 (int part of the value) because the type was wrongly set to int instead of float. Edresson/Coqui-TTS@fe5da49

It would have been nice to have a warning saying that the default value parsed was rounded.