feat!: make ESM properly load ESM endpoint and not masquerade as ESM (#700)

BREAKING CHANGE: This ensures that Framework will properly load the files
from the dist/esm folder. This is BREAKING to ALL plugins that are not
equally updated to load ESM specific files because they will otherwise
load the CJS files of @sapphire/framework and every piece will load twice.
DO NOT use this version without also updating your plugins! Sapphire plugins
have been released alongside this version, third-party plugins will need
to be updated by their respective authors!!

Author: favna

package.json

@@ -8,7 +8,7 @@
 	"exports": {
 		"import": {
 			"types": "./dist/esm/index.d.mts",
-			"default": "./dist/cjs/index.cjs"
+			"default": "./dist/esm/index.mjs"
 		},
 		"require": {
 			"types": "./dist/cjs/index.d.ts",