Improve performance of SourceMapper

[dantleech]

Improve source map performance for directories with same path

This PR aggregates the directories to a map of paths to tuples containing prefixes and suffixes.

This will reduce the overhead of scanning paths when multiple directory elements are defined with the same path but differnet prefixes or suffixes.

For example:

<exclude>
    <directory suffix="Controller.php">src/</directory>
    <directory suffix="Factory.php">src/</directory>
    <directory suffix="Bus.php">src/</directory>
    <directory suffix="Car.php">src/</directory>
</exclude>

Would be resolved as:

[
   'src/' => [
       [], // no prefixes
       ['Controller.php', 'Factory.php', 'Bus.php', 'Car.php'],
   ],
],

The File Iterator already accepts an array of suffixes or prefixes.

---

Imroves perforamance in the example repository from 3.5 to 1.8 seconds.

[sebastianbergmann]

This could, and probably should, target the 11.5 branch instead of main.

[sebastianbergmann]

if you approve of this approach I'll update the tests too

I would appreciate that :) This should be done in a separate PR, though, that I would merge before the change of implementation. Otherwise we would not (really/easily) know that the change of implementation does not change behaviour.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.07%. Comparing base (5f8c741) to head (c308e73).
Report is 1 commits behind head on 11.5.

Additional details and impacted files

@@            Coverage Diff            @@
##               11.5    #6112   +/-   ##
=========================================
  Coverage     95.07%   95.07%           
- Complexity     6960     6965    +5     
=========================================
  Files           731      731           
  Lines         22244    22261   +17     
=========================================
+ Hits          21148    21165   +17     
  Misses         1096     1096           

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[dantleech]

I've rebased, squashed and retargeted at 11.5 - I also added a few more tests as we were missing ones with multiple prefixes/suffixes on the same path.