Configurable Unity Log level to Event and Breadcrumb

[bruno-garcia]

This issue describes this todo:

sentry-unity/src/Sentry.Unity/SentryInitialization.cs

Lines 158 to 159 in d30c776

	// TODO: MinBreadcrumbLevel
	// options.MinBreadcrumbLevel

We should have a configurable minimum level for what becomes a breadcrumb and what becomes an event.
Similar to what other logging integrations do.

Example:
https://github.com/getsentry/sentry-dotnet/blob/357a0eb751414ca5cd7a8a1a476fdf5fa309bcb9/src/Sentry.Extensions.Logging/SentryLogger.cs#L119
and
https://github.com/getsentry/sentry-dotnet/blob/357a0eb751414ca5cd7a8a1a476fdf5fa309bcb9/src/Sentry.Extensions.Logging/SentryLogger.cs#L138

• Add configuration to allow control automatic "log type to breadcrumb" capture
• Add configuration of what log type gets captured as an event

[bruno-garcia]

With such a feature, we could configure the SDK to send an invite for what the warning seeing here as a crumb:

[oddgames-david]

+1 would like to limit reporting only to exceptions, errors still to be in breadcrumbs though.

[mattjohnsonpint]

This should mirror the behavior we have with MinimumBreadcrumbLevel and MinimumEventLevel in Sentry.Extensions.Logging. See https://docs.sentry.io/platforms/dotnet/guides/extensions-logging/#options