[dx] Group naming rules under 'naming' parameter

[TomasVotruba]

Groups all naming rules under a single naming parameter, mirroring the existing mocks / ctor pattern - but on by default.

What

• config/naming-rules.neon now registers its rules via conditionalTags keyed on %symplify.naming%, and absorbs the 3 namespace rules moved out of static-rules.neon:
  • RequireExceptionNamespaceRule
  • RequireAttributeNamespaceRule
  • CheckRequiredInterfaceInContractNamespaceRule (interface must live in a "Contract" namespace)
• naming: true added to parameters + naming: bool() to the schema in config/phpstan-extensions.neon.
• config/naming-rules.neon added to composer.json extra.phpstan.includes, so it auto-loads via phpstan/extension-installer and stays on unless disabled.

Turn all naming rules off with:

parameters:
    symplify:
        naming: false

Notes

• Since naming-rules.neon now auto-loads, it was removed from the README includes: example - keeping a manual include alongside the auto-load would double-register the services. Existing users should drop that manual include line.
• Per-rule README snippets that showed manual rules: registration for these rules were removed to avoid copy-paste double registration.

ECS, Rector, PHPStan and PHPUnit (376 tests) all pass.