chore(sqllab): Remove functionNames from sqlLab state

[justinpark]

SUMMARY

Similar to #23488 and #23257, this commit migrates the functionNames state from redux to rdk-query to reduce the complexity of the queryEditor state.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

After:

after--function_names_query.mov

Before:

before--function_names-query.mov

TESTING INSTRUCTIONS

Go to sqllab and select a database to get the associated function names
Type some part of the function name on the editor and check the autocomplete including the fetched schemas

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 #24026 (d00d6ae) into master (7a55625) will increase coverage by 0.00%.
The diff coverage is 81.81%.

❗ Current head d00d6ae differs from pull request most recent head e7f9f03. Consider uploading reports for the commit e7f9f03 to get more accurate results

@@           Coverage Diff           @@
##           master   #24026   +/-   ##
=======================================
  Coverage   66.54%   66.54%           
=======================================
  Files        1941     1942    +1     
  Lines       75280    75279    -1     
  Branches     8168     8168           
=======================================
+ Hits        50093    50095    +2     
+ Misses      23098    23094    -4     
- Partials     2089     2090    +1     

Flag	Coverage Δ
javascript	54.52% <81.81%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset-frontend/src/SqlLab/actions/sqlLab.js	66.66% <ø> (+0.25%)	⬆️
...d/src/SqlLab/components/SqlEditorLeftBar/index.tsx	62.12% <ø> (+0.92%)	⬆️
superset-frontend/src/SqlLab/fixtures.ts	100.00% <ø> (ø)
...et-frontend/src/SqlLab/reducers/getInitialState.js	90.62% <ø> (ø)
superset-frontend/src/SqlLab/reducers/sqlLab.js	38.46% <ø> (+0.21%)	⬆️
superset-frontend/src/SqlLab/types.ts	57.14% <ø> (ø)
...perset-frontend/src/hooks/apiResources/queryApi.ts	100.00% <ø> (ø)
...d/src/SqlLab/components/AceEditorWrapper/index.tsx	65.90% <66.66%> (-1.54%)	⬇️
...ontend/src/hooks/apiResources/databaseFunctions.ts	100.00% <100.00%> (ø)

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[michael-s-molina]

LGTM