chore: Add option to set a custom color scheme as default

[suddjian]

SUMMARY

Allows setting an extra color scheme as default instead of the standard Superset theme.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

1. Add config for a custom categorical color scheme, with "isDefault": True
2. Create a chart, verify custom color scheme is used

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 #16540 (f0bb761) into master (37c2020) will decrease coverage by 0.26%.
The diff coverage is 79.71%.

❗ Current head f0bb761 differs from pull request most recent head cd66c72. Consider uploading reports for the commit cd66c72 to get more accurate results

@@            Coverage Diff             @@
##           master   #16540      +/-   ##
==========================================
- Coverage   76.64%   76.38%   -0.27%     
==========================================
  Files        1003     1007       +4     
  Lines       53959    54725     +766     
  Branches     7330     7620     +290     
==========================================
+ Hits        41358    41800     +442     
- Misses      12362    12682     +320     
- Partials      239      243       +4     

Flag	Coverage Δ
hive	81.30% <86.56%> (?)
mysql	?
postgres	?
presto	?
python	81.30% <86.56%> (-0.57%)	⬇️
sqlite	?

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

Impacted Files	Coverage Δ
superset-frontend/src/components/Menu/Menu.tsx	71.22% <ø> (+1.43%)	⬆️
superset-frontend/src/dashboard/actions/hydrate.js	1.69% <0.00%> (-0.03%)	⬇️
...et-frontend/src/dashboard/components/Dashboard.jsx	79.59% <ø> (+0.74%)	⬆️
...src/dashboard/components/gridComponents/Column.jsx	91.11% <ø> (+3.23%)	⬆️
...nd/src/dashboard/components/gridComponents/Row.jsx	90.24% <ø> (+3.57%)	⬆️
...mponents/nativeFilters/FiltersConfigModal/utils.ts	73.17% <ø> (-0.45%)	⬇️
...nd/src/dashboard/components/nativeFilters/utils.ts	58.26% <ø> (+2.01%)	⬆️
superset-frontend/src/views/App.tsx	0.00% <0.00%> (ø)
...c/views/CRUD/data/database/DatabaseModal/index.tsx	45.15% <0.00%> (+0.90%)	⬆️
superset/charts/api.py	85.82% <ø> (ø)
... and 90 more

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[geido]

Small catch