fix: Add snap_experimentalProviderRequest to unrestricted methods (#30525)

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## **Description**

This adds `snap_experimentalProviderRequest` to the list of unrestricted
methods.

> [!NOTE]
> This method is experimental, and will be removed in a future update.

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## **Related issues**

Fixes:

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Author: Mrtenz

app/scripts/controllers/permissions/specifications.js

@@ -180,6 +180,7 @@ export const unrestrictedMethods = Object.freeze([
   'snap_scheduleBackgroundEvent',
   'snap_cancelBackgroundEvent',
   'snap_getBackgroundEvents',
+  'snap_experimentalProviderRequest',
   ///: BEGIN:ONLY_INCLUDE_IF(build-mmi)
   'metamaskinstitutional_authenticate',
   'metamaskinstitutional_reauthenticate',

app/scripts/metamask-controller.js

@@ -6455,6 +6455,14 @@ export default class MetamaskController extends EventEmitter {
           'CronjobController:getBackgroundEvents',
           origin,
         ),
+        getNetworkConfigurationByChainId: this.controllerMessenger.call.bind(
+          this.controllerMessenger,
+          'NetworkController:getNetworkConfigurationByChainId',
+        ),
+        getNetworkClientById: this.controllerMessenger.call.bind(
+          this.controllerMessenger,
+          'NetworkController:getNetworkClientById',
+        ),
         ///: BEGIN:ONLY_INCLUDE_IF(keyring-snaps)
         handleSnapRpcRequest: (args) =>
           this.handleSnapRequest({ ...args, origin }),