resolc crate (#328)

- Factor the YUL crate out of `revive-solidity`.
- `revive-solidity` is in reality not a Solidity implementation but the
revive solidity compiler driver (`resolc`). By renaming we not only get
this straight but also a binary with the same name as the crate which
should be less confusing.

---------

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>

crates/integration/src/cases.rs

@@ -1,8 +1,8 @@
 use alloy_primitives::{Address, Bytes, I256, U256};
 use alloy_sol_types::{sol, SolCall, SolConstructor};
 
+use resolc::test_utils::*;
 use revive_llvm_context::OptimizerSettings;
-use revive_solidity::test_utils::*;
 
 #[derive(Clone)]
 pub struct Contract {