CMCL-0000: Add ThirdPersonWithAimMode sample

[glabute]

Purpose of this PR

Added new sample showing how to implement a ThirdPerson FreeLook camera with a user-activated aim mode.
Also shows how to make a custom CinemachineManagerCamera that manages the Aim mode.

Testing status

• Added an automated test
• Passed all automated tests
• Manually tested

Documentation status

• Updated CHANGELOG
• Updated README (if applicable)
• Commented all public classes, properties, and methods
• Updated user documentation

Technical risk

Low - just samples

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e2bf518) 21.06% compared to head (1ac2830) 21.06%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #894   +/-   ##
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  Coverage   21.06%   21.06%           
=======================================
  Files         244      244           
  Lines       27428    27428           
=======================================
  Hits         5778     5778           
  Misses      21650    21650           

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[AntoineCharton]

Awesome!