Timeline allocates increasing amounts of memory when creating tracks, the more tracks you have

The algorithm used to generate unique names for tracks is incredibly wasteful. It iterates over TrackAsset names N^2 times, and each call to Object.name allocates.

Creating a Timeline of 50 tracks allocates 1.5 MB just for name uniqueness.
Creating a Timeline of 1024 tracks allocates 2.71 GB just for name uniqueness.

This is pretty bad in the Editor, but this code also runs at Runtime.

Steps to reproduce:

1. Open a project with Timeline Package
2. Add the attached AnimationUpdatePerfTest script to the project
3. Run the test with the profiler open
4. Observe the allocations

Actual results:  Timeline Allocates a very large amount of memory

Expected results:  Timeline allocates a minimal amount of memory

Reproducible with versions: 

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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