Use Core to in test suite for Phoenix LiveView

[simlay]

This is an experimental/exploratory task to verify feature parity between Phoenix LiveView and LiveView Native Core.

In Phoenix LiveView, a LiveSocket is used around a Phoenix Socket.. This is akin to the current implementation of LiveView Native Core's LiveSocket/LiveChannel.

It would be beneficial to possible run some of the test suites of tests from Phoenix LiveView. There are three different categories.

• npm test which use jest. These don't look to like they hit a backend and are not ran in the browser.
• mix test. These are elixir side tests and possibly use a ClientProxy
• e2e tests. These use playwright, run in a headless browser and do hit a backend.

Anyway, let's see if we can use core in some of these.