message: Add individual build commands for compat packages and demo
diff: "start": "yarn workspace react-querybuilder start",
  "demo": "yarn workspace @react-querybuilder/demo start",
  "build": "lerna run build",
  + "build:antd": "yarn workspace @react-querybuilder/antd build",
  + "build:bootstrap": "yarn workspace @react-querybuilder/bootstrap build",
  + "build:bulma": "yarn workspace @react-querybuilder/bulma build",
  + "build:chakra": "yarn workspace @react-querybuilder/chakra build",
  + "build:demo": "yarn workspace @react-querybuilder/demo build",
  + "build:material": "yarn workspace @react-querybuilder/material build",
  "build:rqb": "yarn workspace react-querybuilder build",
  "test": "jest",
  "test:watch": "jest --watch",
  