Scene update resource finder

[nkoenig]

🎉 New feature

Summary

This adds a /gazebo/resource_paths/resolve service that will return the full path to a file on disk when provided with a URI. Only Fuel and IGN_GAZEBO_RESOURCE_PATH are checked.

This also stores the <scene> information the SceneBroadcaster so that the scene/info service can send over <scene> information.

Test

Path resolver

ign service -s /gazebo/resource_paths/resolve --reqtype ignition.msgs.StringMsg --reptype ignition.msgs.StringMsg --timeout 2000 --req "data:'/tmp'"

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 #1508 (5b85919) into ign-gazebo6 (62272db) will not change coverage.
The diff coverage is n/a.

❗ Current head 5b85919 differs from pull request most recent head dfb3ec2. Consider uploading reports for the commit dfb3ec2 to get more accurate results

@@             Coverage Diff              @@
##           ign-gazebo6    #1508   +/-   ##
============================================
  Coverage        33.58%   33.58%           
============================================
  Files               44       44           
  Lines             2260     2260           
============================================
  Hits               759      759           
  Misses            1501     1501           

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[caguero]

Added a minor fix in 99a868f