Improve loaders load() handling

[uuf6429]

• load() is now guarded by a call to supports() (throwing a LogicException when that returns false)
• improves narrowing the real type of mixed $resource with the use of generics

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.25%. Comparing base (b4870b1) to head (dc84da0). Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #372      +/-   ##
============================================
+ Coverage     96.23%   96.25%   +0.01%     
- Complexity      654      656       +2     
============================================
  Files            43       44       +1     
  Lines          1940     1949       +9     
============================================
+ Hits           1867     1876       +9     
  Misses           73       73              

Flag	Coverage Δ
php8.1	96.25% <100.00%> (+0.01%)	:arrow_up:
php8.1--with=symfony/yaml:^5.4	96.25% <100.00%> (+0.01%)	:arrow_up:
php8.1--with=symfony/yaml:^6.4	96.25% <100.00%> (+0.01%)	:arrow_up:
php8.2	96.25% <100.00%> (+0.01%)	:arrow_up:
php8.3	96.25% <100.00%> (+0.01%)	:arrow_up:
php8.4	96.25% <100.00%> (+0.01%)	:arrow_up:

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[uuf6429]

@stof could you or @carlos-granados review & approve this and #373 please? 🙏

[acoulton]

@stof @carlos-granados would one of you have a chance to take a look at this please?