chore: remove optimism feature (#14545)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

crates/optimism/storage/Cargo.toml

@@ -18,9 +18,3 @@ reth-codecs.workspace = true
 reth-db-api.workspace = true
 reth-prune-types.workspace = true
 reth-stages-types.workspace = true
-
-[features]
-optimism = [
-    "reth-codecs/op",
-    "reth-db-api/optimism",
-]

crates/optimism/storage/src/lib.rs

@@ -6,8 +6,6 @@
     issue_tracker_base_url = "https://github.com/paradigmxyz/reth/issues/"
 )]
 #![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
-// The `optimism` feature must be enabled to use this crate.
-#![cfg(feature = "optimism")]
 
 #[cfg(test)]
 mod tests {