[RFC] Surface of co-log-core

[chshersh]

Our main goal in co-log-core is to create a minimal package with only base in dependencies and enabling more people to use co-log capabilities in a more flexible way.

As proposed by @dcoutts, it might be helpful for other people to:

maximise the ability to use the pattern in different applications by minimising the assumptions

and by moving some parts of co-log-core into co-log.

So let's start a discussion about possible changes in the co-log-core interface.