feat(workflow): improve DX by triggering rebuild on changes

[patzick]

Changes

closes #869
improvements in DX

• package.json will be changed during init to invoke shopware-pwa dev or shopware-pwa build
• files are watched and proper commands are invoked on those changes

it watches for those events (test scenarios):

• override component
• change anything in CMS components
• change something in local plugins
• change local translations
• change local plugins translations

Checklist

• I followed contributing guidelines

[vercel]

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🔍 Inspect: https://vercel.com/shopware-pwa/shopware-pwa-docs/5v2fqfq2s
✅ Preview: https://shopware-pwa-docs-git-feat-dev-experience-invoke-rebuild.shopware-pwa.vercel.app

[mkucmus]

I can confirm that rebuilding is triggered by:
✅ override component
✅ change anything in CMS components
✅ : change something in local plugins
✅ change local translations
✅ change local plugins translations

so from the typical user perspective everything is fine 💪

[mkucmus]

from the functional perspective - everything is fine and works like a charm 💪

[github-actions]

💙 shopware-pwa-canary successfully deployed at https://3cda96b49ee11ce567d1712c96c720a70eb29b23.shopware-pwa-canary.preview.storefrontcloud.io