Create a release process for the chrome extension

[forgetso]

The chrome extension has not been released since June 2022. It is possible to auto publish the extension using a simple Gist and Github CI. This would probably help out people who are waiting on functionality that is already merged into the extension-dapp package.

[jacogr]

It is not ready for release, hence no release has been made.

Some things that spring to mind -

1. It doesn't have support for the new metadata formats as of yet
2. It does not support the new Ledger raw signing functionality
3. It has underlying issues with the signer payloads (certain optional fields)
4. ...

There is no massive manual process behind it, it is an upload of a build to the stores. These are done when ready to release.

[forgetso]

Thanks for clarifying that the current release is not finished. I appreciate all the work you do on PolkadotJS.