fix: move driver import to method

[giftig]

SUMMARY

Accidentally imported a trino driver type at module-level, which can cause problems for users who don't have the trino driver installed.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

Run superset without the trino driver installed.

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

All modified and coverable lines are covered by tests ✅

Comparison is base (2b88225) 69.09% compared to head (805e665) 69.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #26066   +/-   ##
=======================================
  Coverage   69.09%   69.09%           
=======================================
  Files        1940     1940           
  Lines       75867    75867           
  Branches     8444     8444           
=======================================
  Hits        52423    52423           
  Misses      21268    21268           
  Partials     2176     2176           

Flag	Coverage Δ
hive	53.68% <0.00%> (-0.01%)	⬇️
mysql	78.16% <0.00%> (-0.01%)	⬇️
postgres	78.25% <0.00%> (-0.01%)	⬇️
presto	53.63% <0.00%> (-0.01%)	⬇️
python	82.95% <100.00%> (ø)
sqlite	76.91% <0.00%> (-0.01%)	⬇️
unit	55.79% <100.00%> (ø)

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[sfirke]

I'll merge to fix the build - thanks for the prompt fix! - but can you explain the pylint comment to me for learning purposes?

[giftig]

@sfirke pylint lints our python code and looks for bad practices, code smell, etc. Generally it's best practice for imports to be at the top of the file, but as we've seen here, that doesn't always work out for our use case. The comment tells pylint to disregard this one.