binary_mut kernel requires both args to be the same type (which is inconsistent with binary)

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
As part of documenting the _mut compute kernels better in #5798 I noticed in #5798 (comment) thta

binary_mut is inconsistent with binary as it requires both a and b to be the same type of array (where binary can take different types)

Describe the solution you'd like
I would like to have the argument types to binary_mut be different -- so for example, I could write a kernel using binary_mut that took a Float32Array and a Int32Array and added the int32 vale to the float in place.

Describe alternatives you've considered
Leave as is

Additional context
@viirya I think added this API in #3144

[viirya]

It's not intentional but just for the usage at the moment. It could be more general to have different types. I can open a PR to do it.

[tustvold]

label_issue.py automatically added labels {'arrow'} from #5798