[FRAM-149] Add explain middleware

[vincent4vx]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 98.55422% with 6 lines in your changes missing coverage. Please review.

Project coverage is 90.74%. Comparing base (09a00d9) to head (66d0185).
Report is 17 commits behind head on 2.2.

❗ Current head 66d0185 differs from pull request most recent head adf85ba

Please upload reports for the commit adf85ba to get more accurate results.

Files with missing lines	Patch %	Lines
.../Middleware/Explain/ExplainMiddlewareStatement.php	77.77%	4 Missing ⚠️
...Middleware/Explain/ExplainMiddlewareConnection.php	95.23%	1 Missing ⚠️
src/Connection/Middleware/Explain/QueryType.php	93.75%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.2      #87      +/-   ##
============================================
+ Coverage     90.39%   90.74%   +0.34%     
- Complexity     4657     4941     +284     
============================================
  Files           314      339      +25     
  Lines         11893    12519     +626     
============================================
+ Hits          10751    11360     +609     
- Misses         1142     1159      +17     

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