Beekeepy: Add session holder class and session token handling

Bug fixed

---

Issue [if exist]

Adds missing functionality of adding session token to api calls

---

How it was fixed?

Added class that holds session token and derived over it Beekeeper and AsyncBeekeeper

FYI: @wkedzierski

is it ok for you or makes your implementation harder?

Requires: schemas!91 (merged)

helpy/_handles/beekeeper/api/async_api.py

@@ -6,7 +6,6 @@ from helpy._handles.abc.api import AbstractAsyncApi
 from helpy._handles.beekeeper.api.apply_session_token import apply_session_token
 from helpy._handles.beekeeper.api.session_holder import SessionHolder
 from schemas.apis import beekeeper_api  # noqa: TCH001
-from schemas.transaction import Transaction  # noqa: TCH001
 
 
 class BeekeeperApi(AbstractAsyncApi):
@@ -152,7 +151,9 @@ class BeekeeperApi(AbstractAsyncApi):
         raise NotImplementedError
 
     @api
-    async def sign_digest(self, *, sig_digest: str, public_key: str, wallet_name: str | None = None) -> beekeeper_api.SignDigest:
+    async def sign_digest(
+        self, *, sig_digest: str, public_key: str, wallet_name: str | None = None
+    ) -> beekeeper_api.SignDigest:
         """Signs given digest with private key paired with given public key.
 
         Arguments: