Handle different start and end times of components

• connect and _connect get an argument start_time that is to be passed to try_connect instead of self.time
• Connect helper pushes data twice: once for start_time and once for info.time (if it is not equal to start_time)
• Starting time can be passed to component's run(), and is auto-determined if not provided

Basically, only the changes in interfaces.py, schedule.py, component.py and connect_helper.py are of interest. The rest is fixes for the breaking change to the interface.

Fixes #4 (closed)

src/finam/sdk/component.py

@@ -345,7 +345,7 @@ class Component(IComponent, Loggable, ABC):
         self.outputs.frozen = True
 
     def try_connect(
-        self, time=None, exchange_infos=None, push_infos=None, push_data=None
+        self, time, exchange_infos=None, push_infos=None, push_data=None
     ):
         """Exchange the info and data with linked components.