feat: Structured Logging

[bitsandfoxes]

This PR adds support for Structured Logging.

Implementation Context

The tricky part is the separation between UnityLogHandlerIntegration and UnityApplicationLoggingIntegration.

UnityLogHandlerIntegration

• Receives the actual excpetion object we need for line number processing
• Receives all pre-formatted log messages <- we use this to capture structured logs

UnityApplicationLoggingIntegration

• Receives materialized log messages allowing us to capture breadcrumbs without additional allocation
• Receives stringified Unity stack traces we use to attach to events captured via Debug.LogError
• Allows us to capture exceptions on WebGL

Result

[github-actions]

	Messages
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[bitsandfoxes]

It looks like a lot but I've split up the implementation of everything inside of OnLogMessageReceived into:

• IsGettingDebounced
• ProcessException <- responsible for capturing exceptions via logs on WebGL
• ProcessError <- responsible for creating events out of Debug.LogError when configured
• ProcessBreadcrumbs <- responsible for creating breadcrumbs out of logs

[bitsandfoxes]

This is fixing an actual bug where the .NET SDK would automatically add a breadcrumb for exceptions but the actual logmessage would be missing, causing a generic "Exception of type X was captured" breadcrumb.

[bitsandfoxes]

This is the actual change in this file: Capture breadcrumbs only when not capturing structured logs or when explicitly opted in.

[bitsandfoxes]

There is a separate PR that cleans up the unreleated SessionTracking in the LogHandlerIntegration.