perf: Memoize the common_bootstrap_payload

[bkyryliuk]

SUMMARY

Memoize the common_bootstrap_payload. The function includes the config settings and the feature flags, those tend to be changed in frequently, this PR adds caching layer with 1 minute TTL. In our staging deployment it yields 10x speedup e.g. 22 ms down from ~250 ms

BEFORE

AFTER

TESTING INSTRUCTIONS

[x] Dropbox staging

[codecov]

Codecov Report

Merging #21018 (8e3b071) into master (eb5369f) will decrease coverage by 0.20%.
The diff coverage is 50.00%.

❗ Current head 8e3b071 differs from pull request most recent head d62edd4. Consider uploading reports for the commit d62edd4 to get more accurate results

@@            Coverage Diff             @@
##           master   #21018      +/-   ##
==========================================
- Coverage   66.38%   66.18%   -0.21%     
==========================================
  Files        1767     1767              
  Lines       67232    67350     +118     
  Branches     7138     7144       +6     
==========================================
- Hits        44633    44574      -59     
- Misses      20773    20948     +175     
- Partials     1826     1828       +2     

Flag	Coverage Δ
hive	?
mysql	80.95% <49.01%> (-0.08%)	⬇️
postgres	81.01% <49.01%> (-0.09%)	⬇️
presto	?
python	81.12% <49.01%> (-0.46%)	⬇️
sqlite	79.61% <49.01%> (-0.07%)	⬇️
unit	?

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)
...frontend/src/SqlLab/components/SaveQuery/index.tsx	74.35% <ø> (ø)
...ntend/src/explore/components/ExploreChartPanel.jsx	67.60% <0.00%> (-1.41%)	⬇️
...ols/MetricControl/AdhocMetricEditPopover/index.jsx	75.53% <ø> (ø)
...et-frontend/src/explore/reducers/exploreReducer.js	38.70% <0.00%> (-1.30%)	⬇️
superset-frontend/src/utils/datasourceUtils.js	100.00% <ø> (ø)
...s/CRUD/data/database/DatabaseModal/ModalHeader.tsx	66.66% <ø> (ø)
.../src/views/CRUD/data/dataset/DatasetPage/index.tsx	0.00% <0.00%> (ø)
superset/models/helpers.py	39.40% <6.66%> (-1.38%)	⬇️
...c/views/CRUD/data/database/DatabaseModal/index.tsx	31.52% <12.50%> (-0.23%)	⬇️
... and 32 more

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[geido]

LGTM!