Emerge Yul recompiler (#1)

Provide a modified (and incomplete) version of ZKSync zksolc that can compile the most basic contracts

crates/solidity/src/solc/version.rs

@@ -0,0 +1,47 @@
+//!
+//! The Solidity compiler version.
+//!
+
+use serde::Deserialize;
+use serde::Serialize;
+
+///
+/// The Solidity compiler version.
+///
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct Version {
+    /// The long version string.
+    pub long: String,
+    /// The short `semver`.
+    pub default: semver::Version,
+    /// The L2 revision additional versioning.
+    pub l2_revision: Option<semver::Version>,
+}
+
+impl Version {
+    ///
+    /// A shortcut constructor.
+    ///
+    pub fn new(
+        long: String,
+        default: semver::Version,
+        l2_revision: Option<semver::Version>,
+    ) -> Self {
+        Self {
+            long,
+            default,
+            l2_revision,
+        }
+    }
+
+    ///
+    /// A shortcut constructor for a simple version.
+    ///
+    pub fn new_simple(version: semver::Version) -> Self {
+        Self {
+            long: version.to_string(),
+            default: version,
+            l2_revision: None,
+        }
+    }
+}