Implement Yul to LLVM IR compilation benchmarks (#407)

# Description

Closes [#404](https://github.com/paritytech/revive/issues/404)

Adds compilation time benchmarks for:

* Parsing of Yul source code -> AST Object
* Lowering of AST Object -> LLVM IR (unoptimized)

The benchmarks can be run from the root via:

```sh
# Run all benchmarks in the revive-yul crate (parsing + lowering)
make bench-yul
```

HTML reports will be generated under `target/criterion`, and a summary
of the results at
[crates/yul/BENCHMARKS_PARSE_M4PRO.md](https://github.com/paritytech/revive/blob/lj/compilation-benchmarks-yul/crates/yul/BENCHMARKS_PARSE_M4PRO.md)
and
[crates/yul/BENCHMARKS_LOWER_M4PRO.md](https://github.com/paritytech/revive/blob/lj/compilation-benchmarks-yul/crates/yul/BENCHMARKS_LOWER_M4PRO.md)
(currently from running on a Mac M4 Pro).

---------

Co-authored-by: xermicus <cyrill@parity.io>

crates/integration/src/cases.rs

@@ -10,6 +10,7 @@ pub struct Contract {
     pub evm_runtime: Vec<u8>,
     pub pvm_runtime: Vec<u8>,
     pub calldata: Vec<u8>,
+    pub yul: String,
 }
 
 impl Contract {
@@ -19,6 +20,7 @@ impl Contract {
             evm_runtime: compile_evm_bin_runtime(name, code),
             pvm_runtime: compile_blob(name, code),
             calldata,
+            yul: compile_to_yul(name, code, true),
         }
     }
 
@@ -28,6 +30,7 @@ impl Contract {
             evm_runtime: compile_evm_bin_runtime(name, code),
             pvm_runtime: compile_blob_with_options(name, code, true, OptimizerSettings::size()),
             calldata,
+            yul: compile_to_yul(name, code, true),
         }
     }
 }