Fix collection type resolution in DefaultConfiguratorRegistry

[somiljain2006]

Fix unsafe cast in DefaultConfiguratorRegistry for collection types. Use Types.getBaseClass to safely resolve collection element types instead of casting Type directly. This avoids potential ClassCastException and improves handling of nested generics, wildcards, type variables, and custom collection subclasses. Add tests covering raw collections, nested generics, wildcard bounds, type variables, and custom subclasses.

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