rename Metric Classes and change Folder Structure

server/metrics/__init__.py

@@ -1,9 +1,13 @@
-from server.metrics.MemoryMetricsStore import MemoryMetricsStore
-from server.metrics.RedisMetricsStore import RedisMetricsStore
+from .backends.Template import StoreTemplate
+
+from .backends.Memory import MemoryMetricsStore
+from .backends.Redis import RedisMetricsStore
+
+from .MetricsCollector import MetricsCollector
 
 class MetricsStoreBuilder:
   @classmethod
-  def build(self, backend:str="memory", **kwargs) -> MemoryMetricsStore|RedisMetricsStore:
+  def build(self, backend:str="memory", **kwargs) -> StoreTemplate:
     selected = (backend or "memory").strip().lower()
     if selected == "redis":
       return RedisMetricsStore(**kwargs)