A few Kokkos quality of life improvements

[Yurlungur]

PR Summary

In #1075 @brryan recently reported that 1D par_reduce doesn't seem to work. I think this is because it's not supported for the all loop patterns, including simd for loops, which are default on CPU builds. I resolve this by just falling back to Kokkos for all loop patterns in 1D.

I also add overloads in 1D for IndexRange instead of a start and end pair of indices. If this is desirable I can add overloads and fallbacks for other patterns and dimensions in a later pull request.

PR Checklist

• Code passes cpplint
• New features are documented.
• Adds a test for any bugs fixed. Adds tests for new features.
• Code is formatted
• Changes are summarized in CHANGELOG.md
• Change is breaking (API, behavior, ...)
  • Change is additionally added to CHANGELOG.md in the breaking section
  • PR is marked as breaking
  • Short summary API changes at the top of the PR (plus optionally with an automated update/fix script)
• CI has been triggered on Darwin for performance regression tests.
• Docs build
• (@lanl.gov employees) Update copyright on changed files

[lroberts36]

LGTM

[brryan]

LGTM thanks for working this up @Yurlungur! When this automerges I'll test downstream and if it works I'll close #1075