Pull z perf into z2 so that we can run performance tests against zq2 (#…

…867)

* [feat] Store node persistence in the config directory
[feat] Reuse old network configurations.

* (feat) Bring z perf into z2 so we can run it from the zq2 repo

* (fix) Point Zilliqa dependencies to public repos

* (fix) Unignore perf.rs

* [fix] Fix clippy, somewhat.

* (fix) Make rustfmt happy

* (fix) zutils -> zqutils to avoid crate name collision
(fix) there is now a new release of zilliqa-rs that we can depend on.
(fix) allow us (hopefully!) to depend on zilliqa github repos.

.gitignore

@@ -22,6 +22,7 @@ z2_node_*
 # Profiling
 *.svg
 perf.*
+!perf.rs
 
 # RustRover
 .idea