Rename CMake project to gz

[chapulina]

• See CMake project names from ignition to gz gazebo-tooling/release-tools#718
• Needs (common for examples)
  • Rename CMake project to gz gz-common#352

[codecov]

Codecov Report

Merging #82 (c5ef194) into main (edb3df1) will not change coverage.
The diff coverage is n/a.

❗ Current head c5ef194 differs from pull request most recent head ba06fca. Consider uploading reports for the commit ba06fca to get more accurate results

@@           Coverage Diff           @@
##             main      #82   +/-   ##
=======================================
  Coverage   99.35%   99.35%           
=======================================
  Files          17       17           
  Lines         618      618           
=======================================
  Hits          614      614           
  Misses          4        4           

Impacted Files	Coverage Δ
loader/src/cmd/gz.cc
loader/src/cmd/ign.cc	88.88% <0.00%> (ø)

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