Replace template rendering code with Respect\StringFormatter

[henriquemoody]

I've moved almost all the code for placeholder replacement and parameter modifiers into an external library called Respect\StringFormatter. This approach allows us to evolve the template capabilities without making major changes to the Validation code.

This commit will introduce another dependency, respect/string-formatter, and will upgrade the version of respect/string-formatter, which simplifies our internal API greatly.

While making this change, I also updated how we generate exceptions. Instead of rendering the full message and the array of messages, we delegate that creation to the ResultQuery, which improves performance because we don’t need to render those big messages unless the user actually needs them.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.93%. Comparing base (9862963) to head (a372a0b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1615      +/-   ##
============================================
+ Coverage     97.81%   97.93%   +0.11%     
+ Complexity     1007      958      -49     
============================================
  Files           212      197      -15     
  Lines          2339     2228     -111     
============================================
- Hits           2288     2182     -106     
+ Misses           51       46       -5     

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[Copilot]

Pull request overview

This pull request migrates the validation library's message formatting infrastructure to use the external "respect/string-formatter" library, replacing custom implementations with standardized components.

Changes:

• Replaces custom Translator, Modifier, and Stringifier implementations with external library equivalents
• Removes internal message formatting classes (Placeholder classes, modifier implementations)
• Updates to use Symfony TranslatorInterface and respect/stringifier v3.0
• Changes placeholder pipe syntax from 'listOr'/'listAnd' to 'list:or'/'list:and'

Reviewed changes

Copilot reviewed 53 out of 53 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
composer.json	Adds respect/string-formatter dependency, upgrades respect/stringifier to v3.0, adds symfony/translation dev dependency
library/ContainerRegistry.php	Reconfigures DI container to use external formatter/stringifier components instead of internal implementations
library/Message/InterpolationRenderer.php	Simplified to delegate formatting to PlaceholderFormatter from external library
library/Message/Handler/*.php	New handler classes replacing old stringifier implementations
library/Exceptions/ValidationException.php	Constructor changed to accept ResultQuery instead of separate message arrays
library/ValidatorBuilder.php	Updated to pass ResultQuery to ValidationException constructor
tests/unit/Message/InterpolationRendererTest.php	Refactored tests with weaker assertions due to delegation to external library
tests/unit/Message/Handler/ResultStringifierTest.php	Updated to use new Handler API instead of Stringifier
tests/library/Message/*.php	New test helper classes implementing Symfony TranslatorInterface
tests/library/Builders/ResultBuilder.php	Renamed withPath() to path(), added hasPrecedentName() method
tests/feature/*.php	Updated tests for new modifier syntax and ValidationException API
docs/messages/placeholder-pipes.md	Documentation updated for new 'list:or' and 'list:and' syntax
phpstan.neon.dist	Updated suppressions (with one error in method name reference)
Deleted files	Removed 20+ internal implementation files now replaced by external libraries

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