Re-add support for event data field that has been removed in cocotb 2.0

The .data field of cocotb.triggers.Event has been removed in cocotb 2.0.
This is a part of the API exposed by cocotb-bus because Monitor receives
event from external source. It is probably best to keep the current API
until support for cocotb 1.x has been removed from cocotb-bus.

Accordingly, the simpliest solution for this problem is to detect cocotb
2.0 version and re-add the .data field when event.set is being called on
cocotb 2.0.

src/cocotb_bus/compat.py

@@ -15,8 +15,17 @@ def TestFactory(*args, **kwargs):
         return cocotb.regression.TestFactory(*args, **kwargs)
 
 
-def coroutine(f):
-    if parse_version(cocotb.__version__) > parse_version("2.dev0"):
+if parse_version(cocotb.__version__) > parse_version("2.dev0"):
+    def set_event(event, data):
+        event.data = data
+        event.set()
+
+    def coroutine(f):
         return f
 
-    return cocotb.coroutine(f)
+else:
+    def set_event(event, data):
+        event.set(data)
+
+    def coroutine(f):
+        return cocotb.coroutine(f)

src/cocotb_bus/monitors/__init__.py

@@ -17,7 +17,7 @@
 from cocotb.triggers import Event, Timer, First
 
 from cocotb_bus.bus import Bus
-from cocotb_bus.compat import coroutine
+from cocotb_bus.compat import coroutine, set_event
 
 
 class MonitorStatistics:
@@ -51,7 +51,10 @@ class Monitor:
 
     def __init__(self, callback=None, event=None):
         self._event = event
+        if self._event is not None:
+            self._event.data = None  # FIXME: This attribute should be removed on next API break
         self._wait_event = Event()
+        self._wait_event.data = None
         self._recvQ = deque()
         self._callbacks = []
         self.stats = MonitorStatistics()
@@ -134,11 +137,11 @@ def _recv(self, transaction):
             self._recvQ.append(transaction)
 
         if self._event is not None:
-            self._event.set(data=transaction)
+            set_event(self._event, transaction)
 
         # If anyone was waiting then let them know
         if self._wait_event is not None:
-            self._wait_event.set(data=transaction)
+            set_event(self._wait_event, transaction)
             self._wait_event.clear()