Bump TypeScript to 5.3 with verbatimModuleSyntax

This commit upgrades TypeScript to the latest version 5.3 and introduces
`verbatimModuleSyntax` in line with the official Vue guide
recommendatinos (vuejs/docs#2592).

By enforcing `import type` for type-only imports, this commit improves
code clarity and supports tooling optimization, ensuring imports are
only bundled when necessary for runtime.

Changes:

- Bump TypeScript to 5.3.3 across the project.
- Adjust import statements to utilize `import type` where applicable,
  promoting cleaner and more efficient code.

tests/unit/infrastructure/Events/EventSource.spec.ts

@@ -1,7 +1,7 @@
 import {
   describe, it, expect, beforeEach,
 } from 'vitest';
-import { EventHandler, IEventSource, IEventSubscription } from '@/infrastructure/Events/IEventSource';
+import type { EventHandler, IEventSource, IEventSubscription } from '@/infrastructure/Events/IEventSource';
 import { EventSource } from '@/infrastructure/Events/EventSource';
 
 describe('EventSource', () => {

tests/unit/infrastructure/Events/EventSubscriptionCollection.spec.ts

@@ -2,7 +2,7 @@ import { describe, it, expect } from 'vitest';
 import { EventSubscriptionCollection } from '@/infrastructure/Events/EventSubscriptionCollection';
 import { EventSubscriptionStub } from '@tests/unit/shared/Stubs/EventSubscriptionStub';
 import { itEachAbsentCollectionValue } from '@tests/unit/shared/TestCases/AbsentTests';
-import { IEventSubscription } from '@/infrastructure/Events/IEventSource';
+import type { IEventSubscription } from '@/infrastructure/Events/IEventSource';
 
 describe('EventSubscriptionCollection', () => {
   describe('register', () => {