functions: hot containers (#332)

* functions: modify datastore to accomodate hot containers support

* functions: protocol between functions and hot containers

* functions: add hot containers clockwork

* fn: add hot containers support

api/runner/protocol/default.go

@@ -0,0 +1,19 @@
+package protocol
+
+import (
+	"context"
+
+	"github.com/iron-io/functions/api/runner/task"
+)
+
+// DefaultProtocol is the protocol used by cold-containers
+type DefaultProtocol struct {
+}
+
+func (p *DefaultProtocol) IsStreamable() bool {
+	return false
+}
+
+func (p *DefaultProtocol) Dispatch(ctx context.Context, t task.Request) error {
+	return nil
+}