refactor: Update core controllers (v45)

Update core controllers to match the v45 monorepo release. The network
controller has been updated to v7, and the assets controllers have been
updated to v5.1.0.

The phishing controller and message manager updates have been held back
to reduce the scope of the PR. They will be updated in a later PR.

Release notes: https://github.com/MetaMask/core/releases/tag/v45.0.0

This relates to MetaMask/mobile-planning#877

app/core/Engine.ts

@@ -132,8 +132,8 @@ class Engine {
       };
 
       const networkController = new NetworkController(networkControllerOpts);
-      // This still needs to be set because it has the side-effect of initializing the provider
-      networkController.providerConfig = {};
+      networkController.initializeProvider();
+
       const assetsContractController = new AssetsContractController({
         onPreferencesStateChange: (listener) =>
           preferencesController.subscribe(listener),

package.json

@@ -154,7 +154,7 @@
     "@keystonehq/ur-decoder": "^0.6.1",
     "@metamask/address-book-controller": "^2.0.0",
     "@metamask/approval-controller": "^3.4.0",
-    "@metamask/assets-controllers": "~5.0.1",
+    "@metamask/assets-controllers": "^5.1.0",
     "@metamask/base-controller": "^2.0.0",
     "@metamask/composable-controller": "^2.0.0",
     "@metamask/contract-metadata": "^2.1.0",
@@ -164,7 +164,7 @@
     "@metamask/etherscan-link": "^2.0.0",
     "@metamask/gas-fee-controller": "^4.0.0",
     "@metamask/keyring-controller": "^1.0.1",
-    "@metamask/network-controller": "^6.0.0",
+    "@metamask/network-controller": "^7.0.0",
     "@metamask/permission-controller": "^4.0.1",
     "@metamask/phishing-controller": "^3.0.0",
     "@metamask/preferences-controller": "^3.0.0",