Add service.name to well-defined fields and allow configuration throu…

[eirikbell]

ECS 1.6.0 defines service.name as a configurable field to help filter logs by service. Additionally this field is used by kibana to display the name of the service logging an entry when correlating logs in distributed tracing. When using this formatter, adding service.name as a field on the log entry will add it within the nested custom fields.

This PR will enable the possibility of configuring formatter with a service name for all log entries and also overrides this value if entry.Data already contain a value for service.name.

[cla-checker-service]

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• Start Time: 2022-09-13T08:26:46.334+0000

• Duration: 3 min 53 sec

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