* Add a test for the existing behavior of fcvt_from_unit
* Migrate the I8, I16, I32 cases of fcvt_from_uint
* Implement the I64 case of fcvt_from_uint
* Add a test for the existing behavior of fcvt_from_uint.f64x2
* Migrate fcvt_from_uint.f64x2 to ISLE
* Lower the last case of `fcvt_from_uint`
* Add a test for `fcvt_from_uint`
* Finish lowering fcmp_from_uint
* Format