[v2] add slang v2 lexer (#1462)

This final PR adds the actual lexer using the `logos` crate, and adds
some unit tests for it. Note that (partial) integration with sourcify
was added under `temp_sourcify.rs`, to be removed once the lexer is used
(and tested) through the parser instead.

There are some remaining work items to be done (grep for `TODO(v2)`
comments), but it can follow in later PRs.

> NOTE: this is a set of PRs to add the lexer v2, to make reviewing
smaller chunks easier:
>
> 1. #1457
> 2. #1458
> 3. #1459
> 4. #1460
> 5. #1461
> 6. #1462

Author: OmarTawfik

Cargo.lock

@@ -13,6 +13,8 @@ members = [
     "crates/codegen/spec",
     "crates/codegen/testing",
 
+    "crates/codegen-v2/parser",
+
     "crates/infra/cli",
     "crates/infra/utils",
 
@@ -47,6 +49,8 @@ members = [
     "crates/solidity/testing/utils",
 
     "crates/solidity-v2/inputs/language",
+
+    "crates/solidity-v2/outputs/cargo/parser",
 ]
 
 [workspace.dependencies]
@@ -59,6 +63,8 @@ codegen_runner = { path = "crates/codegen/runner", version = "1.3.0" }
 codegen_spec = { path = "crates/codegen/spec", version = "1.3.0" }
 codegen_testing = { path = "crates/codegen/testing", version = "1.3.0" }
 
+codegen_v2_parser = { path = "crates/codegen-v2/parser", version = "1.3.0" }
+
 infra_cli = { path = "crates/infra/cli", version = "1.3.0" }
 infra_utils = { path = "crates/infra/utils", version = "1.3.0" }
 
@@ -94,6 +100,8 @@ solidity_testing_utils = { path = "crates/solidity/testing/utils", version = "1.
 
 solidity_v2_language = { path = "crates/solidity-v2/inputs/language", version = "1.3.0" }
 
+slang_solidity_v2_parser = { path = "crates/solidity-v2/outputs/cargo/parser", version = "1.3.0" }
+
 #
 # External
 #
@@ -125,6 +133,7 @@ Inflector = { version = "0.11.4" }
 itertools = { version = "0.13.0" }
 libc = { version = "0.2.0" }
 log = { version = "0.4.27" }
+logos = { version = "0.15.1" }
 lsp-positions = { version = "0.3.0" } 
 markdown = { version = "0.3.0" }
 nom = { version = "7.1.3" }

Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "codegen_v2_parser"
+description = "Utilities to generate a parser from a language definition."
+version.workspace = true
+rust-version.workspace = true
+edition.workspace = true
+publish = false
+
+[dependencies]
+language_v2_definition = { workspace = true }
+serde = { workspace = true }
+
+[lints]
+workspace = true