extract generation of SQL query string from query map to allow for testing of generated statements

[gkspranger]

• pulled creation of SQL query string out of main (query) function
• generate SQL query string in new (generate-sql-query) function
• call new "generate" function from original "query" function
• inline get of :query/identifiers
• added (comment) to excercise code
• added tests for new (generate-sql-query) function, both simple and complex

i hope i am not being petty here .. i just like to be able to see/test the generated SQL before i actually use it .. i also get the generation of the SQL string is pretty simple, but there is real logic/transformation there that might be good to test

i decided to destructure in the (let) vs the function args so my editor is happy when viewing function docs

[codecov[bot]]

Codecov Report

Merging #165 (d356b69) into master (e890630) will increase coverage by 0.09%. The diff coverage is 82.60%.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   46.82%   46.92%   +0.09%     
==========================================
  Files          94       94              
  Lines        4130     4134       +4     
  Branches      197      195       -2     
==========================================
+ Hits         1934     1940       +6     
  Misses       1999     1999              
+ Partials      197      195       -2     

Impacted Files	Coverage Δ
src/yetibot/core/db/util.clj	72.88% <82.60%> (+2.70%)	:arrow_up:

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