[Feature request]: Introduce nix build (or conan, if we decide to move to it)

[x-mass]

Build result caching feature of build tools will speed up consistent testing significantly.
Currently consistent testing with other repos make them wait untill run of zkLLVM workflow is completed to fetch artifacts. Eg, if we want to consistently test a proof-producer, SyncWith rerun both proof-producer repo and zkLLVM. Then proof-producer has to wait untill zkLLVM finishes (even if no changes were introduces to zkLLVM), since there is a chance that artifacts would be updated. With build caching waiting time for these cases will drop, build will be completed instantly