refactor: rename reactivity package name and APIs

packages/reactivity/src/operations.ts

@@ -0,0 +1,11 @@
+export const enum OperationTypes {
+  // using literal strings instead of numbers so that it's easier to inspect
+  // debugger events
+  SET = 'set',
+  ADD = 'add',
+  DELETE = 'delete',
+  CLEAR = 'clear',
+  GET = 'get',
+  HAS = 'has',
+  ITERATE = 'iterate'
+}