chore: Added more XR deprecation warnings

[jimblanc]

Description of changes

Adds some more XR deprecation warnings to the Sumerian provider & class.

Issue #, if available

Description of how you validated changes

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #10977 (6522424) into main (d3bc119) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main   #10977   +/-   ##
=======================================
  Coverage   81.57%   81.57%           
=======================================
  Files         198      198           
  Lines       19609    19609           
  Branches     4227     4227           
=======================================
  Hits        15996    15996           
  Misses       3323     3323           
  Partials      290      290           

Impacted Files	Coverage Δ
packages/xr/src/Providers/SumerianProvider.ts	46.35% <ø> (ø)
packages/xr/src/XR.ts	68.60% <ø> (ø)

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