feat: concurrency groups (#135)

* first pass at moving controllers around

* feat: concurrency limits for strategy CANCEL_IN_PROGRESS

* fix: linting

* chore: bump python sdk version

python-sdk/examples/concurrency-limit/event_test.py

@@ -0,0 +1,13 @@
+from hatchet_sdk import new_client
+from dotenv import load_dotenv
+
+load_dotenv()
+
+client = new_client()
+
+client.event.push(
+    "concurrency-test",
+    {
+        "test": "test"
+    }
+)

python-sdk/examples/concurrency-limit/worker.py

@@ -0,0 +1,32 @@
+from hatchet_sdk import Hatchet
+from dotenv import load_dotenv
+
+load_dotenv()
+
+hatchet = Hatchet(debug=True)
+
+@hatchet.workflow(on_events=["concurrency-test"])
+class ConcurrencyDemoWorkflow:
+    def __init__(self):
+        self.my_value = "test"
+
+    @hatchet.concurrency(max_runs=5)
+    def concurrency(self, context) -> str:
+        return "concurrency-key"
+
+    @hatchet.step()
+    def step1(self, context):
+        print("executed step1")
+        pass
+
+    @hatchet.step(parents=["step1"],timeout='4s')
+    def step2(self, context):
+        print("started step2")
+        context.sleep(1)
+        print("finished step2")
+
+workflow = ConcurrencyDemoWorkflow()
+worker = hatchet.worker('concurrency-demo-worker', max_threads=4)
+worker.register_workflow(workflow)
+
+worker.start()