misc(moonbit): language update for MoonBit (#1100)

* fix(moonbit): update keywords & grammar and eliminate some warnings

* feat(moonbit): ignore module files & custom project name

* feat(moonbit): f32->float, update grammar and keywords

* misc(moonbit): add canon for list<f32>

* fix(moonbit): length in header for fixedarray

* misc(moonbit): update grammar

* fix(moonbit): use correct length header

* feat: replace todo with new syntax

* chore: adjust warning list for test & adjust signature

* feat: move cabi_realloc to ffi package for better management

Author: peter-jerry-ye