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/yul/src/lexer/error.rs

@@ -0,0 +1,16 @@
+//! The Yul IR lexer error.
+
+use crate::lexer::token::location::Location;
+
+/// The Yul IR lexer error.
+#[derive(Debug, thiserror::Error, PartialEq, Eq)]
+pub enum Error {
+    /// The invalid lexeme error.
+    #[error("{location} Invalid character sequence `{sequence}`")]
+    InvalidLexeme {
+        /// The lexeme location.
+        location: Location,
+        /// The invalid sequence of characters.
+        sequence: String,
+    },
+}