Yc-lockbox

**Features**

[feat: async client implementation](https://github.com/akimrx/python-yc-lockbox/commit/b890983d60ab72bb402fd85d82aeee70e13364de)

**Fix**

[fix(auth,models): improved verify SA for auth, added raising LockboxError when trying call method with empty client](https://github.com/akimrx/python-yc-lockbox/commit/65738f6fc77c9a7f242a632230c37e8e588d573c)

**FIX**

* fix(models.YandexCloudError): added `error_type` computed field, updated typing
* fix(auth): added LRU cache for `_generate_jwt_for_sa` method

**Fix**

* Updated `Secret.refresh()` method. The updated attributes are now assigned to the instance of the class.

**Feat**

* Added `Operation` with `resource` computed field for object manipulate

Fix
* added getitem by index to `SecretPayload.entries`