feat: root context provider extension point

[diegomedina248]

SUMMARY

Adds an extension point in the root context chain to provide a hook at the app level.
This enables custom library installation/configuration that needs to be done at the app level

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #22188 (4945ef6) into master (ac0ff78) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #22188      +/-   ##
==========================================
- Coverage   67.00%   66.99%   -0.01%     
==========================================
  Files        1835     1835              
  Lines       69971    69974       +3     
  Branches     7590     7591       +1     
==========================================
  Hits        46881    46881              
- Misses      21124    21127       +3     
  Partials     1966     1966              

Flag	Coverage Δ
javascript	53.80% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...set-ui-core/src/ui-overrides/ExtensionsRegistry.ts	100.00% <ø> (ø)
...perset-frontend/src/views/RootContextProviders.tsx	0.00% <0.00%> (ø)

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[jfrag1]

LGTM