feat(metadb): handle decimals

[betodealmeida]

SUMMARY

Add support for decimals to the meta database.

Note: this requires updating Shillelagh to 1.2.10, since it needs to convert between decimals and string for SQLite.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

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

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (fbc66a8) 58.90% compared to head (757bff4) 69.08%.

Files	Patch %	Lines
superset/extensions/metadb.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #25921       +/-   ##
===========================================
+ Coverage   58.90%   69.08%   +10.17%     
===========================================
  Files        1941     1941               
  Lines       75882    75891        +9     
  Branches     8443     8443               
===========================================
+ Hits        44700    52431     +7731     
+ Misses      29007    21285     -7722     
  Partials     2175     2175               

Flag	Coverage Δ
hive	53.68% <80.00%> (+<0.01%)	⬆️
javascript	56.27% <ø> (ø)
mysql	78.16% <80.00%> (?)
postgres	78.26% <80.00%> (?)
presto	53.64% <80.00%> (+<0.01%)	⬆️
python	82.91% <90.00%> (+21.16%)	⬆️
sqlite	76.91% <80.00%> (?)
unit	55.75% <90.00%> (+<0.01%)	⬆️

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