Unify logging

[tzdybal]

Currently there are 2 loggers used in optimint:

1. passed from cosmos-sdk
2. used by libp2p

Ideally, only one logger should be used for better control and unification of logging.

libp2p use package-global loggers, and cosmos-sdk pass logger as argument (in context).

[Manav-Aggarwal]

Switch to package level loggers and wrap logging from other loggers in it

[Manav-Aggarwal]

Code Hygiene