Update StoreCommandExecutor to be Sync + Send
This will ensure that we can use it within an Arc<>
@@ -22,7 +22,7 @@ use crate::store::command::StoreCommand;
pub use self::diesel::DieselStoreCommandExecutor;
/// Provides an API for executing `StoreCommand`s
-pub trait StoreCommandExecutor {
+pub trait StoreCommandExecutor: Sync + Send {
type Context;
/// Execute each [`StoreCommand`] in `store_commands`
