Build an instrumented binary with cargo pgo

NOTE TO SELF: Simple set of steps to build with instrumentation information -> pgo -> win. Most of the steps will be calls to cargo pgo, main issue is seeing if running the tests with --pgo will work just fine.

• cargo-pgo: Reference for cargo-pgo: https://github.com/Kobzol/cargo-pgo

Running tests for instrumentation:

cargo run --release --features ssl,jit -- -m test --pgo

NOTE TO SELF: This runs most of the tests but discards usual information that we might care on a normal run (i.e output etc).

NOTE TO SELF: Maybe a small benchmark to see if this has an effect?