Update generated types

[murtukov]

Q	A
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Documented?	no
Fixed tickets	webonyx/graphql-php#425, webonyx/graphql-php#557

As described here webonyx/graphql-php#425, instantiating schemas with many types can hit performance. It was suggested (and implemented) to wrap field type definitions into a closure for lazy loading.

This PR updates the TypeBuilder class to generate proper field types. It wraps only user-defined types into a closure.

Example:

$config = [
    'fields' => fn() => [
        'street' => Type::nonNull(Type::string()),
        'city' => Type::nonNull(Type::string()),
        'zipCode' => Type::nonNull(Type::int()),
        'period' => fn() => Type::nonNull($globalVariables->get('typeResolver')->resolve('Period')),
    ],
];

---

Also some unused methods were removed from TypeResolver, as TypeGenerator never generates references like this:

$globalVariables->get('typeResolver')->resolve('[Address]');

but generates this instead:

Type::listOf($globalVariables->get('typeResolver')->resolve('Address'));