Continuous Profiling could upload JFR files

### Problem Statement

We're currently converting JFR profiles produced by async-profiler directly in the SDK.
We could instead upload the JFR files to Sentry and convert them in the backend.
This would:
- reduce overhead of the SDK
- allow customers to download the raw JFR and use it in other tools as well
- maybe also save payload size for transferring the profile to Sentry

### Solution Brainstorm

Upload JFR files and convert to Sentry Profiles in Sentry backend. Remove in SDK conversion.