Feat/executor json log

[ldmonster]

Overview

When we set LOG_PROXY_HOOK_JSON env, if we have non json hook output - executor must not ignore message and log it without error, but with debug message.
When we return json log from hook, we need to nest it to our log, on the top level, with corresponding log level and message.

What this PR does / why we need it

Add executor logic for handle stdout in non JSON format
Add executor logic for nest outer log in internal log.
Bump logger lib and change old Errors logging for new field.

Special notes for your reviewer