Add rapids-cmake to pipeline

[vyasr]

Depends on rapidsai/rapids-cmake#414

[bdice]

Let's wait to merge this until I can test rapids-core-dependencies downstream with rmm and add an actual dependency there.

[vyasr]

Agreed, I don't have the ability to add labels here though so for now I'll just make this a draft.

[bdice]

@vyasr I discussed with @raydouglass and I think we want this to be in the nightly pipeline even if we don't use the rapids-core-dependencies package yet. We want rapids-cmake to run nightly tests, and running builds of rapids-core-dependencies won't hurt. Let's open this PR and see if we can get it merged. We'll follow up later in rapidsai/rmm#1307 once there is a hard dependency on rapids-core-dependencies to add rapids-cmake to the needs: list for rmm and other packages.

[vyasr]

Sounds good. I've resolved the conflicts here and am happy to see this merged whenever.