Add support for file based configuration (library-config)

[iamluc]

Description

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.99%. Comparing base (f157156) to head (bc0d8ce).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3068      +/-   ##
============================================
- Coverage     74.76%   72.99%   -1.78%     
  Complexity     2790     2790              
============================================
  Files           112      139      +27     
  Lines         11039    15273    +4234     
  Branches          0     1043    +1043     
============================================
+ Hits           8253    11148    +2895     
- Misses         2786     3574     +788     
- Partials          0      551     +551     

Flag	Coverage Δ
appsec-extension	68.37% <ø> (?)
tracer-php	74.76% <ø> (ø)

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see 27 files with indirect coverage changes

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