[ign -> gz] CMake functions

[chapulina]

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

[codecov]

Codecov Report

Merging #89 (7eb2147) into main (df7063e) will increase coverage by 99.67%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           main      #89       +/-   ##
=========================================
+ Coverage      0   99.67%   +99.67%     
=========================================
  Files         0       17       +17     
  Lines         0      616      +616     
=========================================
+ Hits          0      614      +614     
- Misses        0        2        +2     

Impacted Files	Coverage Δ
core/include/gz/plugin/detail/PluginPtr.hh	100.00% <0.00%> (ø)
core/include/gz/plugin/detail/Factory.hh	94.44% <0.00%> (ø)
core/include/gz/plugin/Factory.hh	100.00% <0.00%> (ø)
core/include/gz/plugin/PluginPtr.hh	100.00% <0.00%> (ø)
register/include/gz/plugin/detail/Register.hh	100.00% <0.00%> (ø)
loader/include/gz/plugin/detail/Loader.hh	100.00% <0.00%> (ø)
core/src/Info.cc	100.00% <0.00%> (ø)
core/src/WeakPluginPtr.cc	100.00% <0.00%> (ø)
loader/src/Loader.cc	100.00% <0.00%> (ø)
core/src/utility.cc	100.00% <0.00%> (ø)
... and 7 more

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