refactor: Restructure source code folder

This way the location of certain classes should make more sense

src/http/input/identifier/TargetExtractor.ts

@@ -0,0 +1,8 @@
+import type { HttpRequest } from '../../../server/HttpRequest';
+import { AsyncHandler } from '../../../util/handlers/AsyncHandler';
+import type { ResourceIdentifier } from '../../representation/ResourceIdentifier';
+
+/**
+ * Extracts a {@link ResourceIdentifier} from an incoming {@link HttpRequest}.
+ */
+export abstract class TargetExtractor extends AsyncHandler<{ request: HttpRequest }, ResourceIdentifier> {}