chore: consolidate .editorconfig and move to root

[iartemiev]

This should correctly indent our PRs in GitHub automatically (instead of having to manually append ?ts=2 in the URL)

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

[amhinson]

🙌 LGTM

[codecov]

Codecov Report

Merging #7780 (896bf1b) into main (94d6dff) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #7780   +/-   ##
=======================================
  Coverage   74.07%   74.07%           
=======================================
  Files         214      214           
  Lines       13410    13410           
  Branches     2628     2628           
=======================================
  Hits         9934     9934           
  Misses       3277     3277           
  Partials      199      199           

Impacted Files	Coverage Δ
packages/core/src/Platform/version.ts	100.00% <100.00%> (ø)

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[github-actions]

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