feat: network sync - add main sync logic (#4694)

## Explanation

This adds support for the "main-sync" on network syncing feature. This
will get all a users local networks, and saved remote networks; then
will append/update/delete networks synced across their devices.

We will add the controller integration in a following PR.

## References

https://consensyssoftware.atlassian.net/browse/NOTIFY-1040

## Changelog

### `@metamask/profile-sync-controller`

- **CHANGED**: Renamed the `sync.ts` file to `sync-mutations.ts`
- **ADDED**: `utils` to the `UserStorageController` subpath.
- **ADDED**: `findNetworksToUpdate()` function which will perform the
"main-sync" logic for local and remote network configurations.

## Checklist

- [x] I've updated the test suite for new or updated code as appropriate
- [x] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [x] I've highlighted breaking changes using the "BREAKING" category
above as appropriate

packages/profile-sync-controller/src/controllers/user-storage/network-syncing/__fixtures__/mockNetwork.ts

@@ -1,6 +1,7 @@
-import type { NetworkConfiguration } from '@metamask/network-controller';
-
-import type { RemoteNetworkConfiguration } from '../types';
+import type {
+  NetworkConfiguration,
+  RemoteNetworkConfiguration,
+} from '../types';
 
 export const createMockNetworkConfiguration = (
   override?: Partial<NetworkConfiguration>,
@@ -18,7 +19,7 @@ export const createMockNetworkConfiguration = (
 };
 
 export const createMockRemoteNetworkConfiguration = (
-  override?: Partial<NetworkConfiguration>,
+  override?: Partial<RemoteNetworkConfiguration>,
 ): RemoteNetworkConfiguration => {
   return {
     v: '1',

packages/profile-sync-controller/src/controllers/user-storage/network-syncing/controller-integration.test.ts

@@ -8,7 +8,7 @@ import { waitFor } from '../__fixtures__/test-utils';
 import type { UserStorageBaseOptions } from '../services';
 import { createMockNetworkConfiguration } from './__fixtures__/mockNetwork';
 import { startNetworkSyncing } from './controller-integration';
-import * as SyncModule from './sync';
+import * as SyncModule from './sync-mutations';
 
 jest.mock('loglevel', () => {
   const actual = jest.requireActual('loglevel');

packages/profile-sync-controller/src/controllers/user-storage/network-syncing/controller-integration.ts

@@ -2,7 +2,7 @@ import log from 'loglevel';
 
 import type { UserStorageBaseOptions } from '../services';
 import type { UserStorageControllerMessenger } from '../UserStorageController';
-import { addNetwork, deleteNetwork, updateNetwork } from './sync';
+import { addNetwork, deleteNetwork, updateNetwork } from './sync-mutations';
 
 type SetupNetworkSyncingProps = {
   messenger: UserStorageControllerMessenger;