feat: Enable SIMD optimizations

[matthewfeickert]

• Add x86_64-microarch-level as a 'build' requirement.
  • microarch_level 4 not supported yet so only add level 1 to 3.
  • c.f. Easier cross-compiling for level 4? microarch-level-feedstock#5
• Set the build number based on the microarch_level.
• Add conda_build_config.yaml with microarch_level.
• c.f. https://prefix.dev/blog/building_cpu_optimized_packages
• Bump build number.

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• [N/A] Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

[matthewfeickert]

@conda-forge-admin, please rerender

[matthewfeickert]

@conda-forge/awkward @conda-forge/scikit-hep I'm about to get on a flight, and the CI hasn't finished yet, but assuming it does then this PR is ready for review and merge.