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.

src/infrastructure/Events/EventSource.ts

@@ -1,4 +1,4 @@
-import { EventHandler, IEventSource, IEventSubscription } from './IEventSource';
+import type { EventHandler, IEventSource, IEventSubscription } from './IEventSource';
 
 export class EventSource<T> implements IEventSource<T> {
   private handlers = new Map<number, EventHandler<T>>();

src/infrastructure/Events/EventSubscriptionCollection.ts

@@ -1,5 +1,5 @@
-import { IEventSubscriptionCollection } from './IEventSubscriptionCollection';
-import { IEventSubscription } from './IEventSource';
+import type { IEventSubscriptionCollection } from './IEventSubscriptionCollection';
+import type { IEventSubscription } from './IEventSource';
 
 export class EventSubscriptionCollection implements IEventSubscriptionCollection {
   private readonly subscriptions = new Array<IEventSubscription>();

src/infrastructure/Events/IEventSubscriptionCollection.ts

@@ -1,4 +1,4 @@
-import { IEventSubscription } from '@/infrastructure/Events/IEventSource';
+import type { IEventSubscription } from '@/infrastructure/Events/IEventSource';
 
 export interface IEventSubscriptionCollection {
   readonly subscriptionCount: number;