Add link to ECP registry in the device tree view

[TwitchBronBron]

In the devices view, we should add a button that opens the "registry" ECP http output. Something like this:

It should: open a browser window to this URL: http://${ipOfItemInDeviceView}:8060/query/registry/dev

We register these items in src\viewProviders\OnlineDevicesViewProvider.ts

[MilapNaik]

Adding on to this issue to show a list of apps to pick which app to show the registry for