also refactored BO to class/methods

bo/bo_base.py

@@ -0,0 +1,21 @@
+from abc import ABC, abstractmethod
+
+
+class BOEngine(ABC):
+    name = None
+
+    def __init__(self, config):
+        self.config = config
+        self.state = None
+
+    @abstractmethod
+    def initialize(self):
+        pass
+
+    @abstractmethod
+    def ask(self):
+        pass
+
+    @abstractmethod
+    def tell(self, job_config, y_value):
+        pass