Update grafana/async-profiler from upstream

[aleks-p]

Numerous reported issues in https://github.com/grafana/pyroscope-java stem from our async-profiler fork being behind the upstream repo.

The work here would be to

• update the fork
• release a new version of pyroscope-java
• update all examples to use the latest version of the agent (including span profiles)

[vladst3f]

Hi @aleks-p !
We are very interested in the profiles containing a span id, thus enabling trace-to-profile, and vice-versa. do you have any delivery estimate for the work that you broke down above ?
Cheers!

[korniltsev]

@aleks-p Last time I tried to release I failed, there were some issues in the jenkins pipeline #164

maybe it is time to migrate to gh actions

[aleks-p]

@korniltsev sounds good

@vladst3f no estimate but the first point is getting closer to be done (pending tests)