feat: add parameter for set log verbosity and json format (#10)

## What ❔
Logs in json format and option for set verbosity level for rust 

## Why ❔
It can be useful for specify verbose level.

## Checklist

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defaults/main.yml

@@ -80,6 +80,7 @@ rpc_http_port: 3060
 rpc_ws_port: 3061
 healthcheck_port: 3081
 metrics_port: 3082
+log_verbosity: info
 
 # Monitoring options section
 enable_monitoring: false