Investigate whether there exists a 3rd-party equivalent to our Logger type

[glasser]

Our Logger type is just a basic TS interface (with default implementation provided by the loglevel npm package) for a error/warning/etc thing. We allow folks to pass in any matching implementation and have some tests that show it's possible to use this with winston, bunyan, log4js, and loglevel. We should take at least a moment to see if there's some existing package out there (perhaps just loglevel which is a dependency already) that lets us define this TS type in a way that is compatible with all those implementations without us having to export ourself. (This is part of #FIXME)

[trevor-scheer]

Proposing this, which will also be useful to gateway.
apollographql/apollo-utils#55