fix: adds the ability to disallow SQL functions per engine

[dpgaspar]

SUMMARY

Adds a new configuration key named DISALLOWED_SQL_FUNCTIONS that defines disallowed function per engine on SQL statements. These functions will be disallowed on SQLLab and Charts.

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[bot]]

Codecov Report

Attention: Patch coverage is 92.85714% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.43%. Comparing base (76d897e) to head (396a8e0). Report is 1094 commits behind head on master.

Files with missing lines	Patch %	Lines
superset/db_engine_specs/base.py	75.00%	1 Missing :warning:
superset/exceptions.py	66.66%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #28639       +/-   ##
===========================================
+ Coverage   60.48%   83.43%   +22.94%     
===========================================
  Files        1931      523     -1408     
  Lines       76236    37605    -38631     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    31377    -14737     
+ Misses      28017     6228    -21789     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
hive	48.99% <28.57%> (-0.18%)	:arrow_down:
javascript	?
postgres	77.22% <71.42%> (?)
presto	53.56% <71.42%> (-0.24%)	:arrow_down:
python	83.43% <92.85%> (+19.95%)	:arrow_up:
sqlite	76.68% <71.42%> (?)
unit	58.95% <92.85%> (+1.33%)	:arrow_up:

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