optimize with SmallString; consolidate related re-exports

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/Cargo.toml

@@ -92,6 +92,8 @@ serde_json.workspace = true
 serde_regex.workspace = true
 serde_yaml.workspace = true
 serde.workspace = true
+smallvec.workspace = true
+smallstr.workspace = true
 thiserror.workspace = true
 tikv-jemallocator.optional = true
 tikv-jemallocator.workspace = true