Store processed branch/path function data

[dvdoug]

Hello @sebastianbergmann

The next piece of the work for #380 is attached, this part takes the captured branch/path data that is now available and records the testcase data against it.

[codecov]

Codecov Report

Merging #755 into master will increase coverage by 0.17%.
The diff coverage is 97.14%.

@@             Coverage Diff              @@
##             master     #755      +/-   ##
============================================
+ Coverage     84.25%   84.42%   +0.17%     
- Complexity      853      874      +21     
============================================
  Files            38       38              
  Lines          2521     2555      +34     
============================================
+ Hits           2124     2157      +33     
- Misses          397      398       +1     

Impacted Files	Coverage Δ	Complexity Δ
src/Driver/Driver.php	90.00% <ø> (ø)	10.00 <0.00> (ø)
src/ProcessedCodeCoverageData.php	98.73% <96.96%> (-1.27%)	47.00 <1.00> (+20.00)	⬇️
src/RawCodeCoverageData.php	100.00% <100.00%> (ø)	11.00 <1.00> (+1.00)

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