allow initial state to be passed into the constructor (#3585)

## Explanation

We were not able to use persisted values because the initial state could
not be passed in. This fixes the issue.

## References

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* Fixes #12345
* Related to #67890
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## Changelog

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### `@metamask/selected-network-controller`

- **Added**: Ability to pass in initial state.


## Checklist

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

Author: BelfordZ

packages/selected-network-controller/src/SelectedNetworkController.ts

@@ -86,6 +86,7 @@ export type SelectedNetworkControllerMessenger = RestrictedControllerMessenger<
 >;
 
 export type SelectedNetworkControllerOptions = {
+  state?: SelectedNetworkControllerState;
   messenger: SelectedNetworkControllerMessenger;
 };
 
@@ -109,13 +110,17 @@ export class SelectedNetworkController extends BaseController<
    *
    * @param options - The controller options.
    * @param options.messenger - The restricted controller messenger for the EncryptionPublicKey controller.
+   * @param options.state - The controllers initial state.
    */
-  constructor({ messenger }: SelectedNetworkControllerOptions) {
+  constructor({
+    messenger,
+    state = getDefaultState(),
+  }: SelectedNetworkControllerOptions) {
     super({
       name: controllerName,
       metadata: stateMetadata,
       messenger,
-      state: getDefaultState(),
+      state,
     });
     this.#registerMessageHandlers();
   }