feat: merge changes from master and fix poc-subapp

[arunvishnun]

• Merging changes from master.
• Make poc-subapp (sample application) running with rushjs tooling.
• Remove bluebird reference from sample app and switch to use native promise.
• Switch to use xrun instead of clap in poc-subapp and remove fyn references

How to run sample app

Run below commands

• rush install. Run rush update if you like to recreate pnpm-lock.json. More details here
• rush build
• cd samples/poc-subapp && rushx dev (rushx dev is analogous to previous fun dev command).

How to work on sample apps for testing package changes in the repo

• Rush links packages internally, similar to npm link. So we can work on internal dependencies to test the changes without actually publishing packages/*.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
4 out of 5 committers have signed the CLA.

✅ ashuverma
✅ SRHerzog
✅ arunvishnun
✅ mristic505
❌ srinathm85
_{You have signed the CLA already but the status is still pending? Let us recheck it.}