[ign -> gz] CMake functions

[chapulina]

• Part of CMake API from ign to gz gazebo-tooling/release-tools#719

[codecov]

Codecov Report

Merging #65 (740be93) into main (cdd48b3) will increase coverage by 41.04%.
The diff coverage is n/a.

❗ Current head 740be93 differs from pull request most recent head 1bdc75d. Consider uploading reports for the commit 1bdc75d to get more accurate results

@@            Coverage Diff            @@
##           main      #65       +/-   ##
=========================================
+ Coverage      0   41.04%   +41.04%     
=========================================
  Files         0       17       +17     
  Lines         0     2334     +2334     
=========================================
+ Hits          0      958      +958     
- Misses        0     1376     +1376     

Impacted Files	Coverage Δ
...i/include/vendored-cli/gz/utils/cli/Validators.hpp	19.44% <0.00%> (ø)
include/gz/utils/detail/ImplPtr.hh	91.17% <0.00%> (ø)
...li/include/vendored-cli/gz/utils/cli/TypeTools.hpp	54.80% <0.00%> (ø)
cli/include/gz/utils/cli/GzFormatter.hpp	88.13% <0.00%> (ø)
include/gz/utils/detail/DefaultOps.hh	100.00% <0.00%> (ø)
cli/include/vendored-cli/gz/utils/cli/Split.hpp	47.36% <0.00%> (ø)
include/gz/utils/ImplPtr.hh	100.00% <0.00%> (ø)
cli/include/vendored-cli/gz/utils/cli/Option.hpp	50.94% <0.00%> (ø)
include/gz/utils/NeverDestroyed.hh	100.00% <0.00%> (ø)
cli/include/vendored-cli/gz/utils/cli/Error.hpp	0.00% <0.00%> (ø)
... and 7 more

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