LibJS: Add inline caching for adding new own properties to objects

We already had IC support in PutById for the following cases:
- Changing an existing own property
- Calling a setter located in the prototype chain

This was enough to speed up code where structurally identical objects
(same shape) are processed in a loop:
```js
const arr = [{ a: 1 }, { a: 2 }, { a: 3 }];
for (let obj of arr) {
    obj.a += 1;
}
```

However, creating structurally identical objects in a loop was still
slow:
```js
for (let i = 0; i < 10_000_000; i++) {
    const o = {};
    o.a = 1;
    o.b = 2;
    o.c = 3;
}
```

This change addresses that by adding a new IC type that caches both the
source and target shapes, allowing property additions to be fast-pathed
by directly jumping to the shape that already includes the new property.

Libraries/LibJS/Runtime/Array.cpp

@@ -326,7 +326,7 @@ bool Array::default_prototype_chain_intact() const
     return true;
 }
 
-ThrowCompletionOr<bool> Array::internal_set(PropertyKey const& property_key, Value value, Value receiver, CacheablePropertyMetadata* cacheable_metadata, PropertyLookupPhase phase)
+ThrowCompletionOr<bool> Array::internal_set(PropertyKey const& property_key, Value value, Value receiver, CacheableSetPropertyMetadata* cacheable_metadata, PropertyLookupPhase phase)
 {
     auto& vm = this->vm();