[DOCS] Explain Node Log Levels

[cpengilly]

Brief Description of the Docs Request

We need to educate node operators by explaining node log levels — explain each level, when it makes sense to use, etc.

Description of the Documentation You'd Like

This could be a new guide or an addition to the consensus layer node config page. Here's some basic info about the node log levels for geth: https://geth.ethereum.org/docs/fundamentals/logs

Links to Related Pages

consensus layer config page - https://docs.optimism.io/builders/node-operators/configuration/consensus-config#loglevel how to run a node in the superchain also mentions node log levels - https://docs.optimism.io/builders/node-operators/rollup-node#run-your-node