chore: add link:fix script

Author: mattzcarey

package.json

@@ -56,6 +56,7 @@
         "examples:simple-server:w": "tsx --watch src/examples/server/simpleStreamableHttp.ts --oauth",
         "prepack": "npm run build:esm && npm run build:cjs",
         "lint": "eslint src/ && prettier --check .",
+        "lint:fix": "eslint src/ --fix && prettier --write .",
         "test": "npm run fetch:spec-types && jest",
         "start": "npm run server",
         "server": "tsx watch --clear-screen=false src/cli.ts server",