add test for query with strict keyword

[testercwt]

kwargs in DBInterface will transform to params, therefore strict will be always false in SQLite 1.6.0

[metab0t]

Keywords in definition of DBInterface.execute in SQLite is shadowed by keyword argument version in DBInterface and they are packed with SQL parameters as a whole.

https://github.com/JuliaDatabases/DBInterface.jl/blob/85891482dfc5cd2c6c7c40adaf96ad813c9f0a6d/src/DBInterface.jl#L151

So I think we should remove allowduplicates::Bool = false, strict::Bool = false in function definition as well, but it feels a little strange because we extract two special names from SQL parameters.
What is your opinion @quinnj?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.63%. Comparing base (3e576b9) to head (77a6f4a).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #328      +/-   ##
==========================================
+ Coverage   93.60%   93.63%   +0.03%     
==========================================
  Files           4        4              
  Lines         563      566       +3     
==========================================
+ Hits          527      530       +3     
  Misses         36       36              

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[quinnj]

Yeah, I don't love having to extra the keyword args from the params; let me try to think of an alternative solution here.