[INFRA] Try CPM

[eseiler]

• Todo: update readme
• use cpm download script,
  • but include actual cpm in cpack source package (?)
• gtest/benchmark
• robin_hood? Not maintained, better to keep here for fixes
• define dependencies and their versions in one place
• is CPM's SYSTEM option sufficient? (yes, with cmake >= 3.25)
• use CPMFindPackage instead of CPMAddPackage and remove changing default CPM_USE_LOCAL_PACKAGES would be unconfigurable to do non-local

Simde is also multiple MiB big, so being able to use a package for that dramatically reduces our library size when installed

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Name	Status	Preview	Comments	Updated (UTC)
hibf	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 9, 2023 1:18pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ab2dc4b) 99.94% compared to head (54bc94a) 99.94%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #161   +/-   ##
=======================================
  Coverage   99.94%   99.94%           
=======================================
  Files          45       45           
  Lines        1796     1796           
=======================================
  Hits         1795     1795           
  Misses          1        1           

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[eseiler]

Also check SIMDE_ENABLE_OPENMP