Adding metadata after printing a new line in Trivially Copyable structures

[tarun-t]

Current Behavior

When using an operator<< overload to log user-defined types, the metadata (timestamp, log level, etc.) is only logged for the first line of output. Subsequent lines produced by the custom operator do not include this metadata.

Desired Behavior

All lines of output produced by an operator<< overload should include the appropriate metadata, maintaining consistency with single-line log entries.

[odygrd]

I've implemented this for the next release. It introduces an approximate 1.8% overhead in backend thread processing, which isn't that bad, so I'm enabling it by default.