[CON-169] Simplify CN child logger pattern

[SidSethi]

Description

• simplify setFieldsInChildLogger logic
• change name to createChildLogger for accuracy
• update calls

working example https://replit.com/@SidSethi/Child-logging#index.js

Tests

existing CN tests failed until final commit
Ensure logs called by sendResponse and sendResponseWithHeartbeatTerminator look correct:

• sendResponse is called by handleResponse which is used in /health_check

[2022-05-25T15:22:20.070Z]  INFO: audius_creator_node/67 on 0d34096fabb8: Success (requestID=8BX5ROjBy, requestMethod=GET, requestHostname=cn1_creator-node_1, requestUrl=/health_check, duration=34, statusCode=200, logLevel=info)

• sendResponseWithHeartbeatTerminator is called by handleResponseWithHeartbeat which is used in /health_check/duration/heartbeat

[2022-05-25T15:25:08.934Z]  INFO: audius_creator_node/67 on 0d34096fabb8: Error processing request: Missing required query parameters || Request Body: {} || Request Query Params: {} (requestID=tFyI9U9Lh7, requestMethod=GET, requestHostname=34.69.173.123, requestUrl=/health_check/duration/heartbeat, duration=1, statusCode=400, errorMessage="Missing required query parameters", logLevel=info)

How will this change be monitored? Are there sufficient logs?

Monitor above logs

[dmanjunath]

one question and small ask but overall this approach looks good