Numba JIT decorator is missing in `stumpy/maamp.py:: _maamp` and `stumpy/mstump.py::_mstump`

[NimaSarajpoor]

The NJIT decorator is missing for the functions _maamp (in stumpy/maamp.py) and _mstump(in stumpy/mstump.py)

[seanlaw]

Actually, this is not needed. Both _maamp and _mstump do not need to be njit-ed as it is the inner function, _compute_multi_D that is njit-ed

[NimaSarajpoor]

Going to close this issue and its corresponding PR #1000.