Added shaderType converage

[ahcorde]

Signed-off-by: ahcorde [email protected]

🎉 New feature

Summary

Related with gazebosim/gz-sim#1575

Backported ShaderType TEST from this PR #671

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #740 (c5c036e) into ign-rendering3 (d4d071b) will increase coverage by 0.17%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           ign-rendering3     #740      +/-   ##
==================================================
+ Coverage           76.88%   77.06%   +0.17%     
==================================================
  Files                 100      100              
  Lines                7805     7805              
==================================================
+ Hits                 6001     6015      +14     
+ Misses               1804     1790      -14     

Impacted Files	Coverage Δ
src/ShaderType.cc	100.00% <0.00%> (+87.50%)	⬆️

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