db.py: Refactor type annotations

[RA80533]

• scanResultEvent()'s arguments were not documented correctly. Many of them could be list in addition to str.
• Note that scanResultEvent() is not called correctly in several places (filterFp is often passed as the third arg).
• scanConfigSet()'s scan_id was incorrectly documented as being an int (it's actually a str). It doesn't appear that this distinction matters to any of the places the function was called.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.75%. Comparing base (d8f628b) to head (3bf759a).
Report is 9 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1787   +/-   ##
=======================================
  Coverage   46.74%   46.75%           
=======================================
  Files         690      690           
  Lines       45701    45706    +5     
=======================================
+ Hits        21365    21370    +5     
  Misses      24336    24336           

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