Python Eventstore client injection

[tzununbekov]

With this client injection and coming Function CRD PR users will be able to store and read data from their Python functions as follow:

   import eventstore_client as client

    def endpoint(event, context):
      c = client.new()      
      global_kv = c.new_kv()
      global_kv.set("key1", "value1")
      ...