chore(FF): adding generic X axis Feature Flag (default: False)

[rusackas]

SUMMARY

The product has already supported the GENERIC_CHART_AXES feature flag, but it was not set in config.py with a default/overridable setting. This PR merely plops it in there, and should have no visible/functional change to a default configured deployment of Superset.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

N/A, but flip the flag and check out the cool new features if you'd like

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 #18801 (9d09fab) into master (8dc2377) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #18801   +/-   ##
=======================================
  Coverage   66.31%   66.31%           
=======================================
  Files        1620     1620           
  Lines       63088    63088           
  Branches     6372     6372           
=======================================
  Hits        41839    41839           
  Misses      19592    19592           
  Partials     1657     1657           

Flag	Coverage Δ
hive	52.22% <ø> (ø)
javascript	51.25% <ø> (ø)
mysql	81.42% <ø> (ø)
postgres	81.47% <ø> (ø)
presto	52.06% <ø> (ø)
python	81.90% <ø> (ø)
sqlite	81.16% <ø> (ø)

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

Impacted Files	Coverage Δ
superset/config.py	91.92% <ø> (ø)

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[zhaoyongjie]

LGTM

[sadpandajoe]

🏷️ preset:2022.7

[sadpandajoe]

🏷 preset:2022.7