Fix Serializer return type for arrays of primitives

[yoeunes]

Fixes type inference for primitive scalar types (int, string, bool, float) when used with Serializer::deserialize().

Currently, the extension wraps all base types in ObjectType. This means int[] is incorrectly inferred as an array of objects named "int" rather than scalar integers, causing false positives during arithmetic operations.

[yoeunes]

While working on this fix, I noticed we could simplify and future-proof this code by using PHPStan's native TypeStringResolver instead of manual parsing.

Proposed refactoring:

$types[] = $this->typeStringResolver->resolve($constantString->getValue());

I kept the minimal fix here, because changing the constructor to inject the resolver would be a backward compatibility break