Compare perf across MRTK2 and 3

[MaxWang-MS]

This issue has been migrated a new MRTK repository, and the status of this issue will now be tracked at the following location:

• Compare perf across MRTK2 and 3 MixedRealityToolkit/MixedRealityToolkit-Unity#368

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Compare MRTK2 and 3 perf in some comparable scene(s) to get a concrete understanding of where we stand in performance right now.

[AMollis]

@srinjoym we should verify performance of MRTK3 before GA release

[AMollis]

Performance is comparable to MRTK2, expect for the MRTK3's primary button and dialog types (canvas versions)

We've opened a sperate task to investigate improvements to these components:

• Investigate performance improvements to canvas UI #11471