Structured Logging Improvements

[bitsandfoxes]

Description

I've put the structured log capture into UnityLogHandlerIntegration and not the UnityApplicationLoggingIntegration because there we have access to the pre-formatted template and args that can directly be passed into the logger without having to format the message ourselves.

Turns out, the .NET SDK calls string.Format in any case anyway, see DefaultStructuredLogger.

Additionally, the origin is missing.

The way forward I see is to move the capture into the UnityApplicationLoggingIntegration and use the already formatted string provided to construct the SentryLog object and pass that into the logger to be captured.

[linear]

UNITY-180