Enable (newline-delimited) JSON logging

[andreibancioiu]

Reasoning behind the pull request

• Often, it's useful to have a more structure representation of the Node's logs.

Proposed changes

• Add a JSON formatter mx-chain-logger-go#33
• Add a new CLI flag: --log-save-json. Logs will be written to a *.jsonl file (new-line delimited JSON).
• Can be used on its own, or together with --log-save (log files will be paired).

Testing procedure

• Standard testing
• Enable only standard file logging, without JSON logging
• Enable only JSON file logging, without standard file logging
• Enable both standard file logging and JSON logging

Example of a log line (excerpt from a .jsonl log file):

{"Message":"highest final shard block","LogLevel":1,"Args":["shard","1","nonce","821198"],"Timestamp":1733518032262273416,"LoggerName":"process/block","Correlation":{"Shard":"1","Epoch":685,"Round":822772,"SubRound":"(END_ROUND)"}}

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

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