feat: UI override registry

[suddjian]

SUMMARY

When serving Superset, there are many cases where it may be desirable to customize specific UI elements. This PR introduces a UiOverrideRegistry for that purpose.

The new TypedRegistry is better suited for this than the existing Registry class, because different keys can have different types of values, and all the keys offered by Superset are enumerated here.

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 #19671 (6f0f7dc) into master (9554135) will decrease coverage by 0.00%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master   #19671      +/-   ##
==========================================
- Coverage   66.47%   66.46%   -0.01%     
==========================================
  Files        1681     1683       +2     
  Lines       64467    64459       -8     
  Branches     6607     6609       +2     
==========================================
- Hits        42856    42845      -11     
- Misses      19917    19920       +3     
  Partials     1694     1694              

Flag	Coverage Δ
javascript	51.12% <70.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
...d/packages/superset-ui-core/src/models/Registry.ts	100.00% <ø> (ø)
...rc/dashboard/components/DashboardEmbedControls.tsx	9.43% <25.00%> (+1.27%)	⬆️
...kages/superset-ui-core/src/models/TypedRegistry.ts	100.00% <100.00%> (ø)
...set-ui-core/src/ui-overrides/UiOverrideRegistry.ts	100.00% <100.00%> (ø)
superset-frontend/src/views/components/Menu.tsx	50.00% <0.00%> (-10.00%)	⬇️
...perset-frontend/src/views/CRUD/welcome/Welcome.tsx	74.22% <0.00%> (-0.78%)	⬇️
...set-frontend/src/components/Icons/AntdEnhanced.tsx	100.00% <0.00%> (ø)
.../explore/components/ExploreViewContainer/index.jsx	54.39% <0.00%> (ø)

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[sadpandajoe]

🏷️ preset:2022.15