fix: made type-metadata.storage.ts much faster

Changed the data modeling of type-metadata storage to store the data in maps instead of arrays.
This results in a dramatic improvement of application startup time since many of the lookups for metadata are now in O(1) instead of O(n)

Author: roypeled

packages/graphql/lib/schema-builder/collections/array.collection.ts

@@ -1,15 +1,35 @@
-export class ArrayCollection<T> extends Array<T> {
-  constructor(private globalArray: Array<T>) {
-    super();
+export class ArrayCollection<T> {
+  private array: T[] = [];
+
+  constructor(private globalArray: Array<T>) {}
+
+  getAll() {
+    return this.array;
   }
 
   push(...items): number {
     this.globalArray.push(...items);
-    return super.push(...items);
+    return this.array.push(...items);
   }
 
   unshift(...items): number {
     this.globalArray.unshift(...items);
-    return super.unshift(...items);
+    return this.array.unshift(...items);
+  }
+
+  reverse() {
+    return this.array.reverse();
+  }
+
+  reduce<U>(
+    callbackfn: (
+      previousValue: U,
+      currentValue: T,
+      currentIndex: number,
+      array: T[],
+    ) => U,
+    initialValue: U,
+  ): U {
+    return this.array.reduce(callbackfn, initialValue);
   }
 }

packages/graphql/lib/schema-builder/collections/metadata.storage.collection.list.ts

@@ -30,8 +30,8 @@ export class MetadataStorageCollectionList {
   }
 
   compile() {
-    this.reversePredicate((t) => t.classDirectives);
-    this.reversePredicate((t) => t.classExtensions);
+    this.reversePredicate((t) => t.classDirectives.getAll());
+    this.reversePredicate((t) => t.classExtensions.getAll());
     this.reversePredicate((t) => t.fieldDirectives.getAll());
     this.reversePredicate((t) => t.fieldExtensions.getAll());
   }

packages/graphql/lib/schema-builder/storages/type-metadata.storage.ts

@@ -257,7 +257,9 @@ export class TypeMetadataStorageHost {
         item.properties = this.getClassFieldsByPredicate(item);
       }
       if (!item.directives) {
-        item.directives = this.targets.get(item.target).classDirectives;
+        item.directives = this.targets
+          .get(item.target)
+          .classDirectives.getAll();
       }
       if (!item.extensions) {
         item.extensions = this.targets