feat: add cron picker to AlertReportModal

[nytai]

SUMMARY

• adds react-js-cron library with translation strings to src/common/components
• adds a cron picker based on react-js-cron to the AlertReportModal
• adds a storybook entry for react-js-cron example usage with a free-form input.
• fixes flex-wrap style at lower screen widths
• adds crontab_humanized api field to reports api (uses cron-descriptor python lib)

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

After:

Humanized "Schedule" column

TEST PLAN

• manual testing
  • AlertReportModal contains a cron picker
  • changes to cron picker are reflected in the text input.
  • changes to text input, followed by a blur or entry key, are reflected in cron-picker
• storybook component testing.
• unit tests for AlertReportCronScheduler component

ADDITIONAL INFORMATION

• Changes UI

[codecov-io]

Codecov Report

Merging #12032 (b96957b) into master (fda3a2f) will decrease coverage by 4.81%.
The diff coverage is 14.70%.

@@            Coverage Diff             @@
##           master   #12032      +/-   ##
==========================================
- Coverage   57.99%   53.17%   -4.82%     
==========================================
  Files         907      438     -469     
  Lines       44719    15715   -29004     
  Branches     4056     4060       +4     
==========================================
- Hits        25934     8357   -17577     
+ Misses      18785     7358   -11427     

Flag	Coverage Δ
cypress	53.17% <14.70%> (+6.32%)	⬆️
python	?

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

Impacted Files	Coverage Δ
superset-frontend/src/common/components/index.tsx	100.00% <ø> (ø)
...perset-frontend/src/views/CRUD/alert/AlertList.tsx	1.47% <0.00%> (-0.05%)	⬇️
...CRUD/alert/components/AlertReportCronScheduler.tsx	5.55% <5.55%> (ø)
...frontend/src/views/CRUD/alert/AlertReportModal.tsx	4.17% <20.00%> (+0.02%)	⬆️
...rset-frontend/src/common/components/CronPicker.tsx	33.33% <33.33%> (ø)
superset-frontend/src/common/components/Select.tsx	60.00% <100.00%> (ø)
...ntend/src/dashboard/components/PropertiesModal.jsx	59.45% <0.00%> (-1.81%)	⬇️
...rsions/a9c47e2c1547_add_impersonate_user_to_dbs.py
superset/examples/helpers.py
.../c2acd2cf3df2_alter_type_of_dbs_encrypted_extra.py
... and 543 more

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[lilykuang]

I pulled this branch and tried this out. LGTM