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/resolc/src/project/contract/metadata.rs

@@ -0,0 +1,43 @@
+//! The Solidity contract metadata.
+
+use serde::Serialize;
+
+use crate::ResolcVersion;
+
+/// The Solidity contract metadata.
+/// Is used to append the metadata hash to the contract bytecode.
+#[derive(Debug, Serialize)]
+pub struct Metadata {
+    /// The `solc` metadata.
+    pub solc_metadata: serde_json::Value,
+    /// The `solc` version.
+    pub solc_version: String,
+    /// The pallet revive edition.
+    pub revive_pallet_version: Option<semver::Version>,
+    /// The PolkaVM compiler version.
+    pub revive_version: String,
+    /// The PolkaVM compiler optimizer settings.
+    pub optimizer_settings: revive_llvm_context::OptimizerSettings,
+    /// The extra LLVM arguments give used for manual control.
+    pub llvm_arguments: Vec<String>,
+}
+
+impl Metadata {
+    /// A shortcut constructor.
+    pub fn new(
+        solc_metadata: serde_json::Value,
+        solc_version: String,
+        revive_pallet_version: Option<semver::Version>,
+        optimizer_settings: revive_llvm_context::OptimizerSettings,
+        llvm_arguments: Vec<String>,
+    ) -> Self {
+        Self {
+            solc_metadata,
+            solc_version,
+            revive_pallet_version,
+            revive_version: ResolcVersion::default().long,
+            optimizer_settings,
+            llvm_arguments,
+        }
+    }
+}