Move generated message to details folder

[nkoenig]

Signed-off-by: Nate Koenig nate@openrobotics.org

🦟 Bug fix

Summary

Our doxygen process filters out files in in the detail folder. With the ign to gz rename, we moved all of the generated message files to a detail subfolder. This prevented them from being processed by doxygen.

This PR instead uses a details (note the plural s) folder for the generated messages.

Checklist

• Signed all commits for DCO
• Added tests
• 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 #304 (bec5cd9) into gz-msgs9 (b09619a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           gz-msgs9     #304   +/-   ##
=========================================
  Coverage     95.41%   95.41%           
=========================================
  Files            10       10           
  Lines          1026     1026           
=========================================
  Hits            979      979           
  Misses           47       47           

Impacted Files	Coverage Δ
src/Generator.cc	92.75% <100.00%> (ø)

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