Proposer add logging and registration check

[Westlad]

This PR fixes a bug in the dev environment (or indeed any environment) whereby restarting the proposer application will fail if it has already been registered with optimist. It does that by requesting a list of registered proposers from optimist and only attempting to register if its address is not on the list.

This PR also adds some logging to the nf3 class. Specifically, opening, closing, messaging and errors are all now logged for the proposer websocket, although actual log details are limited because of the way websockets work.

Note that to add the logger, some the rather brittle common-files psuedo-packaging has been removed from proposer and user-local as this did not work well when importing both common-files and cli. It is unnecessary in any case now the Dockerfiles have been moved to the repository root.

The e2e test script runners in package.json have been modified to disable logging when these are run, otherwise the test output is spammed with log data.

To test, run the ping-pong tests (see the readme in tests/ping-pong). You will see the new log output as the test proceeds. If you wish to test duplicate registration, the easiest way is to add await nf3.registerProposer(); at line 24 of index.mjs. This will force the proposer to attempt to register twice. A warning will be logged and the second attempt will not proceed.

[signorecello]

Just a shout out so we have consistent env variable locations