Use resources for allocations

There are allocations in reducers, sorts, and scans that we currently use internal memory pools to satisfy for GPU backends.
Use the resource provided to satisfy those allocations instead.

• This PR is a feature
• It does the following:
  • Adds resource allocation of internal buffers at the request of me and Alan

Design review (for API changes or additions---delete if unneeded)

On (date), we reviewed this PR. We discussed the design ideas:

1. First idea or goal
2. Second idea
3. Third idea

This PR implements 1. and 3. It leaves out 2. for the following reasons

• (impractical)
• (too big)
• (not a good idea anyway)