Runme logging in output channel

[christian-bromann]

fixes #454

This is a simple patch that makes Runme log into an dedicated output channel. I kept it intentionally simple for now as we don't know yet many requirements for our logging. For now, this gives us a central point/module to handle logging. I looked into existing logging package which all seem overkill and came with some issues, e.g. @vscode-logging/logger would print out a JSON blog rather than a simple log line.

Something I would have liked to address but is not possible at the moment:

• colors in output channel: currently not supported (see ANSI colors in OutputChannel microsoft/vscode#571)
• add a command to copy out all logs from our channel to support users debugging issues: also currently not supported Add ability to read outputChannel text. microsoft/vscode#65108

@mxsdev would this prevent the error reported in the original issue to happen again?

Demo:

Interface:

import getLogger from './logger'

const log = getLogger('someScope')
log.info('I am an info message')
log.error('I am an error message')

[mxsdev]

I've been wanting this for months 🤩 thank you for doing this!

[christian-bromann]

Addressed comments and fixed tests.

[mxsdev]

LGTM

[christian-bromann]

[mxsdev]

Forgot to mention one last thing!