[garden] Added shininess to material message

[WilliamLewww]

🎉 New feature

Depends on:

• [garden] Added <shininess> to <material> sdformat#1018

Summary

Adds the shininess data member to material.proto. The new data member is required for setting the shininess value to visuals in gz-sim.

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 #251 (aaeee10) into main (2770d34) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head aaeee10 differs from pull request most recent head 3c2943b. Consider uploading reports for the commit 3c2943b to get more accurate results

@@            Coverage Diff             @@
##             main     #251      +/-   ##
==========================================
- Coverage   15.90%   15.90%   -0.01%     
==========================================
  Files         382      382              
  Lines       71409    71427      +18     
==========================================
  Hits        11361    11361              
- Misses      60048    60066      +18     

Impacted Files	Coverage Δ
include/gz/msgs/odometry_with_covariance.pb.h
include/gz/msgs/test.pb.cc
include/gz/msgs/topic_info.pb.h
include/gz/msgs/sensor.pb.h
include/gz/msgs/bytes.pb.h
include/gz/msgs/pose_with_covariance.pb.h
include/gz/msgs/gps.pb.h
include/gz/msgs/odometry.pb.cc
include/gz/msgs/sky.pb.cc
include/gz/msgs/magnetometer_sensor.pb.h
... and 754 more

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