Replace dispatch'srequires_backend function for arraylias integration

[to24toro]

Summary

Replaced dispatch's requires_backend func to remove the dependency to dispatch.

Details and comments

[to24toro]

Can we update the code using the new requires_array_library before deleting dispatch folder?

[to24toro]

I updated the code.

• reverting dispatch.py.
• updating the code using the func requires_backend.