Use `foreach_point` premitive to fuse pointwise kernels

With the recent changes in ClimaCore we have access to the `foreach_point` primitive that we can use to fuse pointwise operations into larger kernels.

We need to apply it throughout the repository.

We should use sub-issues to track different parts of the codebase we will review for the `foreach_point` usage.

Start by reviewing the repository for pointwise operations that could use the `foreach_point` primitive, then group the findings into sub-issues for separate parts of the codebase. Done means the relevant repository areas have been reviewed and the needed work is tracked through those sub-issues.

Written by the indexing model from the issue text.