Sentry Structured Logging for Java

[AbhiPrasad]

Description

https://develop.sentry.dev/sdk/telemetry/logs/

Sentry is adding support for structured logging. Let's add it to the Java/Android SDKs!

1. Define the logs protocol and log envelope item in the SDK
2. Add the Public API (SDK options and methods) as per the docs
3. Make sure the the SDK follows the documented behavior
4. Attach default attributes to the SDK as per docs
5. Instrument popular logging libraries to send logs to Sentry. SDK maintainers can best decide what they should support, but we should definitely support the same integrations that we do in the SDK today.
6. Create a GH discussion that contains instructions for setting up the SDK in your repo. Eventually this will be moved into the primary docs. See the JS SDK's GH discussion for inspiration.

We'll create another issue for Android after this.