feat: Propagate traceId to the Android SDK

[bitsandfoxes]

Proof of concept. Java errors share the same trace ID as the events coming from the C# layer. Native errors lack the trace context.

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## Unreleased

- Propagate `traceId` to the Android SDK ([#1997](https://github.com/getsentry/sentry-unity/pull/1997))

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[bruno-garcia]

Ideally we get a hook from the .NET SDK so when a new trace-id is set there, we are able to pass that down to native.

Similar to ScopeObserver. Perhaps it should live there actually.

Because we don't want a single trace id for the lifetime of the game ideally. It should recycle "at some point". Perhaps when a scene loads? We could also reset if session ends/restarts.