Advertise NumPy 2 support and test against numba==0.57 and numpy==1.23

[seberg]

Description

This is mostly gh-1606, but continues it:

• Also implementing wheel testing
• Start advertising support for NumPy 2 (which is no problem for RMM).

It then uses this to enforce that we run tests with numba==0.57 and numpy==1.23 so that tests are not only run with NumPy 2 when bumping.
This is not particularly important for RMM, but interesting for other RAPIDS libraries.

Planned changes:

• Matthew suggested renaming earliest, I would like to rename it to oldest, but I cannot without creating a branch in the shared workflow (I think).
• Need to merge the shared workflow branch before merging.
• Since the NumPy dependency is very light, I just used numpy<3 as a pin. We could also use a rule like current+2 throughout RAPIDS.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[seberg]

Closing, going to continue on original PR.

[seberg]

Sorry for the noise, will continue here after all.