feat: trigger updates to IProcedureBlock blocks (#6570)

* feat: add interface and method for updating procedure blocks

* chore: remove module ID declarations

* feat: add actually triggering updates

* chore: format

* chore: clean up tests

core/interfaces/i_procedure_block.ts

@@ -0,0 +1,19 @@
+/**
+ * @license
+ * Copyright 2022 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type {Block} from '../block.js';
+
+
+/** The interface for a block which models a procedure. */
+export interface IProcedureBlock {
+  doProcedureUpdate(): void;
+}
+
+/** A type guard which checks if the given block is a procedure block. */
+export function isProcedureBlock(block: Block|
+                                 IProcedureBlock): block is IProcedureBlock {
+  return (block as IProcedureBlock).doProcedureUpdate !== undefined;
+}