fix(core): correct main and types paths in package.json

Paths pointed to index.ts but actual file is at src/index.ts.

Co-authored-by: Ona <no-reply@ona.com>

packages/aris-core/package.json

@@ -2,8 +2,8 @@
 	"name": "@aris/core",
 	"version": "0.0.0",
 	"type": "module",
-	"main": "index.ts",
-	"types": "index.ts",
+	"main": "src/index.ts",
+	"types": "src/index.ts",
 	"scripts": {
 		"test": "bun test ."
 	}