Added port constrain to list scheduler, added example and updated tests

• Added port constrain to list scheduler, so that user can specify an upper bound on memory accesses.

• Changed so that if the user does not specify a constraint on Inputs/Outputs they will be assumed to be 1. (This in order to prepare for doing the same thing for resources)

• Added example showcasing the memory constraining.

• Placed current tests into a unit test folder.

• Added two integration tests going from SFG generation to architecture.

• Bumped the timeout from 20s to 30s for the pipeline.

(Also, now that we have split testing we could add another stage in the CI for it.)

Closes: #302 (closed) #282 (closed)

b_asic/architecture.py

@@ -396,6 +396,13 @@ class ProcessingElement(Resource):
         assign: bool = True,
     ):
         super().__init__(process_collection=process_collection, entity_name=entity_name)
+
+        if not isinstance(process_collection, ProcessCollection):
+            raise TypeError(
+                "Argument process_collection must be ProcessCollection, "
+                f"not {type(process_collection)}"
+            )
+
         if not all(
             isinstance(operator, OperatorProcess)
             for operator in process_collection.collection