Adds appliesTo to verify if a given rule should be applied

[micheleorselli]

This is a tentative fix for #434. It introduces a new method, appliesTo, which is used to decide if a given rules should be applied to the class under examination, eg:

• final classes, enums, interfaces, trait, cannot be abstract so we exclude them when we check if a given class is abstract or not, because they cannot have that property by definition.

Caveat: with this fix a rule defined in that way

$rule = Rule::allClasses()
            ->that(new ResideInOneOfTheseNamespaces('App\Abstract'))
            ->should(new IsAbstract())
            ->because('we want to prefix abstract classes');

would miss any final class present in the namesapce App\Abstract. Is that what we want?

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.79%. Comparing base (13d5528) to head (7e3923a).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/PHPUnit/ArchRuleCheckerConstraintAdapter.php	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #454      +/-   ##
============================================
+ Coverage     93.62%   94.79%   +1.16%     
- Complexity      593      606      +13     
============================================
  Files            69       69              
  Lines          1601     1614      +13     
============================================
+ Hits           1499     1530      +31     
+ Misses          102       84      -18     

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[fain182]

would miss any final class present in the namespace App\Abstract. Is that what we want?

I don't think this would be the expected behaviour from our users....

[micheleorselli]

this snippet was adding the dependency derived by attributes twice

[micheleorselli]

removed because even if we are on php 7.4 php parser can parse php 8 code.

[fain182]

this isFinal should not be there?