feat(native-filters): add null option to value filter

[mironovmeow]

SUMMARY

This PR add option of "null" for the select filter in the Dashboard's Native Filter.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

1. Set "DASHBOARD_NATIVE_FILTERS": True in superset/config.py
2. Open Dashboard with null var in DB (I use "Video Game Sales")
3. Open Dashboard Native Filter with column publisher

ADDITIONAL INFORMATION

• Has associated issue: Fixes Dashboard Native Filter: cannot filter null values #15291
• 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

[villebro]

Thanks alot for this improvement! I didn't know that SqlAlchemy does an on-the-fly OR statement when mixing NULLs and actual values in IN clauses:
. This needs some linter fixing + I would appreciate a few unit tests. Please ping me on Slack if you need help, would love to get this in asap!

[villebro]

LGTM

[codecov]

Codecov Report

Merging #15419 (8382b3d) into master (f53b2c6) will decrease coverage by 0.25%.
The diff coverage is 63.17%.

❗ Current head 8382b3d differs from pull request most recent head fc730e1. Consider uploading reports for the commit fc730e1 to get more accurate results

@@            Coverage Diff             @@
##           master   #15419      +/-   ##
==========================================
- Coverage   77.22%   76.97%   -0.26%     
==========================================
  Files         975      974       -1     
  Lines       50634    50816     +182     
  Branches     6222     6727     +505     
==========================================
+ Hits        39104    39117      +13     
- Misses      11319    11484     +165     
- Partials      211      215       +4     

Flag	Coverage Δ
hive	?
javascript	71.77% <66.97%> (+0.02%)	⬆️
presto	?

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

Impacted Files	Coverage Δ
...erset-frontend/src/components/AnchorLink/index.jsx	95.83% <ø> (ø)
...rset-frontend/src/components/ErrorMessage/types.ts	100.00% <ø> (ø)
...src/components/FilterableTable/FilterableTable.tsx	82.26% <ø> (ø)
superset-frontend/src/components/Select/Select.tsx	0.00% <0.00%> (ø)
superset-frontend/src/constants.ts	100.00% <ø> (ø)
superset-frontend/src/dashboard/actions/hydrate.js	1.72% <ø> (ø)
...frontend/src/dashboard/components/Header/index.jsx	67.15% <ø> (ø)
...dashboard/components/SliceHeaderControls/index.tsx	76.98% <ø> (ø)
...c/dashboard/components/gridComponents/Markdown.jsx	82.82% <ø> (ø)
...d/src/dashboard/components/gridComponents/index.js	100.00% <ø> (ø)
... and 56 more

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