Make device contains take a template key parameter

[PointKernel]

Contributes to #26

Closes #172

This PR makes the device contains APIs take a template key parameter. It also includes

• update CI script to unblock CI failure
• clean up tests by using thrust::identity

[PointKernel]

rerun tests

[ttnghia]

Suggested change

	__device__ std::enable_if_t<std::is_invocable_v<KeyEqual, ProbeKey, Key>, bool> contains(
	__device__ std::enable_if_t<std::is_invocable_r_v<bool, KeyEqual, ProbeKey, Key> && std::is_invocable_r_v<bool, KeyEqual, Key, ProbeKey>, bool> contains(

[PointKernel]

The condition here is not a requirement check. It's just to differentiate CG API and non-CG API cause if we pass three template parameters to contains, the compiler cannot know which one we are referring to. e.g. https://github.com/PointKernel/cuCollections/blob/3b0adf597ed828f3813030452fb39f9b1735c90b/tests/static_map/custom_type_test.cu#L217

[ttnghia]

This looks good to me. I will try to test and will update.

[ttnghia]

Update: I have successfully adopted this: rapidsai/cudf#10656 (code).

Thanks again for working on it.

[jrhemstad]

tbh, all these static_asserts are overkill. If someone passes in an invalid callable, it will still fail to compile, just with a different error message. This feels like a ton of complexity to maintain.

[jrhemstad]

I pointed to is_invocable just for the purposes of documentation. I didn't intend that we need to static_assert all of the requirements of the function.

[PointKernel]

I've removed those static_assert as requested and updated corresponding docs.

I agree that so many asserts are painful to maintain now but the situation will be improved after the grand refactor where we only need one set of those static asserts in the base class as opposed to putting them in every involved function for all map types.