[PM-7289] implement generator libraries (#9549)

This is a copy of the files. The source in `@bitwarden/common` will be deleted once
all of the applications have been ported to the library.

libs/common/src/tools/generator/rx-operators.ts

@@ -1,45 +1,10 @@
-import { distinctUntilChanged, map, OperatorFunction, pipe } from "rxjs";
+import { map, pipe } from "rxjs";
+
+import { reduceCollection, distinctIfShallowMatch } from "@bitwarden/common/tools/rx";
 
 import { DefaultPolicyEvaluator } from "./default-policy-evaluator";
 import { PolicyConfiguration } from "./policies";
 
-/**
- * An observable operator that reduces an emitted collection to a single object,
- * returning a default if all items are ignored.
- * @param reduce The reduce function to apply to the filtered collection. The
- *  first argument is the accumulator, and the second is the current item. The
- *  return value is the new accumulator.
- * @param defaultValue The default value to return if the collection is empty. The
- *   default value is also the initial value of the accumulator.
- */
-export function reduceCollection<Item, Accumulator>(
-  reduce: (acc: Accumulator, value: Item) => Accumulator,
-  defaultValue: Accumulator,
-): OperatorFunction<Item[], Accumulator> {
-  return map((values: Item[]) => {
-    const reduced = (values ?? []).reduce(reduce, structuredClone(defaultValue));
-    return reduced;
-  });
-}
-
-/**
- * An observable operator that emits distinct values by checking that all
- *   values in the previous entry match the next entry. This method emits
- *   when a key is added and does not when a key is removed.
- * @remarks This method checks objects. It does not check items in arrays.
- */
-export function distinctIfShallowMatch<Item>(): OperatorFunction<Item, Item> {
-  return distinctUntilChanged((previous, current) => {
-    let isDistinct = true;
-
-    for (const key in current) {
-      isDistinct &&= previous[key] === current[key];
-    }
-
-    return isDistinct;
-  });
-}
-
 /** Maps an administrative console policy to a policy evaluator using the provided configuration.
  *  @param configuration the configuration that constructs the evaluator.
  */