[MPS] Add `random_` overload (#98333)
That simply calls `torch.random_(from=0, to=None)`
Also, fix optional upper bound calculation for all `dtypes` but int64:
As one can see from https://pytorch.org/docs/stable/generated/torch.Tensor.random_.html
`from` boundary is inclusive, but `to` is exclusive, i.e. if `to` is
omitted for `torch.int8` dtype, it should be set to `128` and to `2`
for torch.bool.
Add test for `torch.random_`
Fixes https://github.com/pytorch/pytorch/issues/98118
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98333
Approved by: https://github.com/kulinseth
