feat: enable pyroscope deltaprof

[lizthegrey]

Which problem is this PR solving?

• On long-lived services like Refinery with large process uptimes, the number of distinct stacks and code addresses grows in the profile as time goes on; this causes high numbers of bytes to be scraped when collecting profiles for timeseries that aren't increasing in value very often but have been seen at least once in process lifetime.

Short description of the changes

• Opts into https://github.com/grafana/godeltaprof for delta profiles which do not have the weakness above.

[TylerHelmuth]

I don't know anything about profiling but all the names line up. With 2.0 coming out so soon I'd like @kentquirk review and also opinion on whether this should be included in 2.0 or 2.1.

[lizthegrey]

I don't know anything about profiling but all the names line up. With 2.0 coming out so soon I'd like @kentquirk review and also opinion on whether this should be included in 2.0 or 2.1.

It's the same code as is in hound if there are any concerns :)