add pyroscope (#4871)

* pyroscope

* fixup

* add pyroscope target

* fixins

* spellcheck

* rename 'pyroscoped' feature to 'pyroscope'

* build testnet binary with pyroscope feature

* Update Cargo.toml

Co-authored-by: Andronik <write@reusable.software>

* make args a string, resolve using std::net

* fixup

* remove --features pyroscope for testnet builds

Until the panics are fixed in upstream, this is sane.

* chore: bump pyroscope to 0.3.1

Fixes an underflow panic.

* Revert "remove --features pyroscope for testnet builds"

This reverts commit 57dbdc7aa5f6427aeb1e3dfdfc97071c3a74851e.

* fix: Make sample rate a prime

Co-authored-by: Pierre Besson <pierre.besson@parity.io>
Co-authored-by: Andronik <write@reusable.software>