fix: export types needed for EntityMixin

Author: Tomaszal

packages/endpoint/src/index.ts

@@ -15,6 +15,7 @@ export * as schema from './schema.js';
 export type { Array, Invalidate, Collection, DefaultArgs } from './schema.js';
 export { default as Entity } from './schemas/Entity.js';
 export { default as EntityMixin } from './schemas/EntityMixin.js';
+export type { IEntityClass, IEntityInstance } from './schemas/EntityTypes.js';
 export { default as validateRequired } from './validateRequired.js';
 export type {
   EndpointInterface,