CMCL-0000: Add FlyAround sample scene

[glabute]

Purpose of this PR

I'm tired of being asked on the forums about how to do a fly-around camera, so here is a sample that shows it.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.68%. Comparing base (c97b6a7) to head (9d98ae1).
Report is 11 commits behind head on main.

❗ Current head 9d98ae1 differs from pull request most recent head 305bfb4. Consider uploading reports for the commit 305bfb4 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #926   +/-   ##
=======================================
  Coverage   26.67%   26.68%           
=======================================
  Files         246      246           
  Lines       27572    27563    -9     
=======================================
- Hits         7356     7355    -1     
+ Misses      20216    20208    -8     

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[AntoineCharton]

Is it expected? 2023.2 hdrp input system.

Default material assigned to the fly around object.

[glabute]

The warning is fixed on the other PR.
Nice catch on the material

[unity-cla-assistant]

All committers have signed the CLA.

[AntoineCharton]

Very nice!

[glabute]

Did you have some issues about the control mappings? Also, does it make sense on both keyboard/mouse and gamepad?