chore: break out api into a purely sync api in prep for async variant

Author: sighphyre

UnleashClient/__init__.py

@@ -15,7 +15,7 @@
 from apscheduler.triggers.interval import IntervalTrigger
 from yggdrasil_engine.engine import UnleashEngine
 
-from UnleashClient.api import register_client
+from UnleashClient.api.sync_api import register_client
 from UnleashClient.connectors import (
     BaseConnector,
     BootstrapConnector,

UnleashClient/api/__init__.py

@@ -1,4 +0,0 @@
-# ruff: noqa: F401
-from .features import get_feature_toggles
-from .metrics import send_metrics
-from .register import register_client