feat(config): add db.prepare_stmt config option (#760)

[qwqcode]

The Prepared Statement database feature is enabled by default. You can disable it in config file or a env variable ATK_DB_PREPARE__STMT=0.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (4012d3e) 34.79% compared to head (887142c) 34.76%.

Files	Patch %	Lines
internal/db/open.go	0.00%	8 Missing ⚠️
internal/db/db.go	50.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #762      +/-   ##
==========================================
- Coverage   34.79%   34.76%   -0.04%     
==========================================
  Files         115      115              
  Lines        4696     4709      +13     
==========================================
+ Hits         1634     1637       +3     
- Misses       2957     2965       +8     
- Partials      105      107       +2     

Flag	Coverage Δ
go	34.76% <21.42%> (-0.04%)	⬇️

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