fix: fix TypeScript type definitions for commonjs (#5196)

This is done by duplicating `index.d.ts` into `index.d.cts`, and
modifying it for CommonJS. The same was done for type tests.

Unfortunately I was unable to find a way to re-use types without
drastically changing the code base.

To test this, a minimum TypeScript version of 4.7 is needed, so it has
been updated. The old types still work with older TypeScript versions.

Co-authored-by: Jay <jasonsaayman@gmail.com>

tsconfig.json

@@ -1,14 +1,9 @@
 {
   "compilerOptions": {
-    "module": "es2015",
+    "module": "node16",
     "lib": ["dom", "es2015"],
     "types": [],
-    "moduleResolution": "node",
     "strict": true,
-    "noEmit": true,
-    "baseUrl": ".",
-    "paths": {
-      "axios": ["."]
-    }
+    "noEmit": true
   }
 }