fix(types): add typings for Immutable.js realm

Author: char0n

types/evaluate/realms/immutable.ts

@@ -0,0 +1,13 @@
+import type { EvaluationRealm } from '../../index';
+
+declare class ImmutableEvaluationRealm extends EvaluationRealm {
+  public readonly name: 'immutable';
+
+  public override isArray(node: unknown): boolean;
+  public override isObject(node: unknown): boolean;
+  public override sizeOf(node: unknown): number;
+  public override has(node: unknown, referenceToken: string): boolean;
+  public override evaluate<T = unknown>(node: unknown, referenceToken: string): T;
+}
+
+export default ImmutableEvaluationRealm;