make dev build faster again #4133
Merged
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cc @ryyppy
The recent addition of refmt_api.ml (a huge file) makes the dev build significantly slowed down.
(the refmt_api.ml is more than 158,000 loc which takes a while to compile)
I move those files into a separate folder, those 3 files will still be snapshot whenever we do any changes but not type checked, they are mostly packed files