* test kvstore in intregration tests with different databases
* escape 'key' in delete query
* export quote and use it in kvstore
(cherry picked from commit d1aefa1792)
Co-authored-by: Jean-Philippe Quéméner <JohnnyQQQQ@users.noreply.github.com>
* add key/value store service
* don't export kvStoreSQL, consumers should interact with KVStore & NamespacedKVStore
* add del method, avoid ErrNotFound (#38627)
* switch value column to medium text
Co-authored-by: Alexander Emelin <frvzmb@gmail.com>