Revert "feat: clean up the Plugin ABC"

This reverts commit 3e5ff9b.

We can't do this without changing how the plugins handle request_func
since @abstractmethods must be implemented not assigned.

plugins/plugin.py

@@ -1,12 +1,15 @@
-from abc import ABC, abstractmethod
+class Plugin:
+    def __init__(self, args):
+        self.args = args
 
-from result import RequestResult
+    def request_http(self, query, user_id):
+        pass
 
+    def streaming_request_http(self, query, user_id):
+        pass
 
-class Plugin(ABC):
-    def __init__(self, args):
-        self.args = args
+    def request_grpc(self, query, user_id):
+        pass
 
-    @abstractmethod
-    def request_func(self, query: dict, user_id: int, test_end_time: float) -> RequestResult:
+    def streaming_request_grpc(self, query, user_id):
         pass