Do not skip dataclass fields starting with `_`

[junrushao-openai]

Currently MLC skips a dataclass field if its name starts with an underscore:

mlc-python/python/mlc/dataclasses/utils.py

Lines 154 to 155 in a0eb687

	if field_name.startswith("_"):
	continue

This could be a pretty surprising footgun given downstream applications may use the underscore _ convention quite a lot.

There's no fundamental reason MLC has to skip _ fields AFAICT, so could you please reconsider this convention? If MLC really wants to support skipped fields, how about naming them as _mlc_* instead?

[potatomashed]

Thanks for reporting! This is indeed a UX issue. I like the _mlc_* idea. Fixed in #53