package.json: Fix yarn lint script so eslint runs on all .ts files without listing specific directories

[Connor Adams]

Would be nice if:

• We didn't have to remember to update this if we add/move/rename folders
• It works on both linux bash and windows pwsh

  "scripts": {
    "lint": "yarn tsc --noEmit && eslint . src/*.ts src/handlers/*.ts src/storage/*.ts test/*.ts",
  }