cl-parser: Move parser into its own crate

cl-parser/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "cl-parser"
+repository.workspace = true
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+cl-ast = { path = "../cl-ast" }
+cl-token = { path = "../cl-token" }
+cl-structures = { path = "../cl-structures" }
+conlang = { path = "../libconlang" }