feat(toml): Expose toml_edit errors

This officially adds `toml_edit` to the public API but this will let RLS
use these errors and stay up-to-date without manual intervention.

Author: epage

src/cargo/util/toml/mod.rs

@@ -36,6 +36,9 @@ use crate::util::{
 mod targets;
 use self::targets::targets;
 
+pub use toml_edit::de::Error as TomlDeError;
+pub use toml_edit::TomlError as TomlEditError;
+
 /// Loads a `Cargo.toml` from a file on disk.
 ///
 /// This could result in a real or virtual manifest being returned.