Prevent cache lock for long DB statement parsing

[jtduffy]

Resolves #2262

This change refactors the cache put logic so that on a cache miss, the agent parses the DB statement outside of the put operation (as was done previously) so that parsing very large SQL statements doesn't lock the cache.

Note that this doesn't improve the regex performance against very very large SQL statements; it simply prevents the cache from being locked while the statement is being parsed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.51%. Comparing base (9be91b8) to head (dbf4a39).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2294      +/-   ##
============================================
- Coverage     70.68%   70.51%   -0.18%     
+ Complexity    10355    10029     -326     
============================================
  Files           844      844              
  Lines         41310    40619     -691     
  Branches       6331     6160     -171     
============================================
- Hits          29200    28641     -559     
+ Misses         9283     9193      -90     
+ Partials       2827     2785      -42     

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