…enerics

This is a work-in-progress to properly specify generic types instead of
ignoring the missingType.generics errors in PHPStan.

Changes include:
- Add @template annotations to Helper, View subclasses, Cache classes
- Add proper generic type parameters to method signatures
- Fix Collection, ORM, Event system generic types

Progress: ~210 of 405 errors fixed (52%)

Remaining work needed for complete fix.

Complete the fix for generic type annotations by:
- Add generic types to Association.php methods (attachTo, find, etc.)
- Add @phpstan-ignore for self-referential generics in EventDispatcherTrait
- Fixes all remaining missingType.generics errors

Remaining 69 errors are different types (return.type, argument.type,
generics.interfaceConflict) not related to the original missingType.generics issue.

- Add @phpstan-ignore comments for Collection return type mismatches
- Add path-specific ignores for generics.interfaceConflict in TreeIterator/TreePrinter
- Add path-specific ignores for argument.type covariance issues in Cache/ORM
- Use consistent SelectQuery generic types in Association.php

- Cache.php: inline ignore for NullEngine fallback
- TableRegistry.php: inline ignore for TableLocator
- bootstrap.php: inline ignore for TableLocator

generics.interfaceConflict must remain in config (PHPStan limitation
for class-level interface conflicts)

- Remove unused import EntityInterface from EagerLoader
- Remove @inheritdoc when combined with @param/@return (coding standard violation)
- Add proper type hints and @param annotations

Resolve conflict in Hash.php: keep updated link URLs from 5.x
and generic type annotations from this branch.

- Resolve merge conflict in CollectionTrait.php by keeping both generic
  templates and @require-implements annotation
- Fix Association::find() return type to SelectQuery<EntityInterface|array>
  to be compatible with BelongsToMany::find() override

Add @phpstan-ignore for argument.type errors where cascade callback
code iterates over query results. The SelectQuery template includes
array type for non-hydrated results, but cascade callbacks always
use hydration, so entities are guaranteed.