Remove circular dependencies in core (#6408)

* Remove core::result dependency from blocktree

* Remove core::result dependency from shred

* Move Packet from core::packet to sdk::packet

This way we don't need to split perf_libs yet.

* Disable packet when compiling BPF programs

core/src/perf_libs.rs

@@ -1,6 +1,6 @@
-use crate::packet::Packet;
 use core::ffi::c_void;
 use dlopen::symbor::{Container, SymBorApi, Symbol};
+use solana_sdk::packet::Packet;
 use std::env;
 use std::ffi::OsStr;
 use std::fs;