feat: add bump-packages generator

[edusperoni]

adds nx generate @nativescript/plugin-tools:bump-packages which will bump all libraries by default.

Examples:

nx generate @nativescript/plugin-tools:bump-packages patch
nx generate @nativescript/plugin-tools:bump-packages minor
nx generate @nativescript/plugin-tools:bump-packages minor
nx generate @nativescript/plugin-tools:bump-packages 2.0.0

also allows filtering by tag and specifying specific project name.

• does not publish
• does not build
• does not apply changes if any of the bumps fail
• does not change root package.json

Intended to be used in a release script:

{
  "scripts": {
     "version": "node tools/version-handler.js && npm run changelog"
   "changelog": "..."
   }
}

// cli
npm version patch

// version-handler.js

const version = require('../package.json').version
const command = `nx generate @nativescript/plugin-tools:bump-packages ${version}`
// run command
// run git add packages/*/package.json

Then a later script can build and publish all packages