Opencl allocation

[dsding2]

[inducer]

Thanks! Could you look at the test failures? The typo and the type errors will get addressed via #937 before this lands, so feel free to ignore those for now, unless they seem related to your code.

Edit: you can also ignore the doctest mismatches (in tutorial.rst).

[inducer]

#937 has landed, and CI on the main branch now passes cleanly. It might be worth updating this to see how things go.