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/ModuleNamespaceObject.cpp

@@ -136,7 +136,7 @@ ThrowCompletionOr<bool> ModuleNamespaceObject::internal_has_property(PropertyKey
 }
 
 // 10.4.6.8 [[Get]] ( P, Receiver ), https://tc39.es/ecma262/#sec-module-namespace-exotic-objects-get-p-receiver
-ThrowCompletionOr<Value> ModuleNamespaceObject::internal_get(PropertyKey const& property_key, Value receiver, CacheablePropertyMetadata* cacheable_metadata, PropertyLookupPhase phase) const
+ThrowCompletionOr<Value> ModuleNamespaceObject::internal_get(PropertyKey const& property_key, Value receiver, CacheableGetPropertyMetadata* cacheable_metadata, PropertyLookupPhase phase) const
 {
     auto& vm = this->vm();
 
@@ -183,7 +183,7 @@ ThrowCompletionOr<Value> ModuleNamespaceObject::internal_get(PropertyKey const&
 }
 
 // 10.4.6.9 [[Set]] ( P, V, Receiver ), https://tc39.es/ecma262/#sec-module-namespace-exotic-objects-set-p-v-receiver
-ThrowCompletionOr<bool> ModuleNamespaceObject::internal_set(PropertyKey const&, Value, Value, CacheablePropertyMetadata*, PropertyLookupPhase)
+ThrowCompletionOr<bool> ModuleNamespaceObject::internal_set(PropertyKey const&, Value, Value, CacheableSetPropertyMetadata*, PropertyLookupPhase)
 {
     // 1. Return false.
     return false;