build(tsconfig): Updates config, adds build:watch script

- Build files now include sourcemaps and declarations
- No longer compiles non-ts files
- package.json includes build:watch script

Signed-off-by: Alix von Schirp <github@avonschirp.bootmedia.de>

package.json

@@ -50,6 +50,7 @@
   },
   "scripts": {
     "build": "tsc",
+    "build:watch": "tsc --watch",
     "check": "pnpm lint && pnpm typecheck",
     "docs:generate": "typedoc",
     "format:check": "prettier --check .",
@@ -68,4 +69,4 @@
     "*.{js,ts,jsx,tsx,json,css,md}": "prettier --write"
   },
   "type": "module"
-}
+}