CW-580: BIP39 Wallets Shared Seed Implementation: "One Seed - Multiple Wallets" (#1307)

* feat: Implement creating new BIP39 wallet with same seed used for other owned BIP39 wallets

* feat: Use same seed for BIP39 Wallets

* Update pre_existing_seeds_page.dart

* Feat: BIP39 Same seed wallet creation using the Common Parent Wallet Strategy

* feat: Finalize implementing preexisting seeds

* feat: Implement shared bip39 wallet seed for Bitcoin wallet type

* feat: Implement shared bip39 wallet seed for Litecoin wallet type

* feat: Implement shared bip39 wallet seed for BitcoinCash wallet type

* feat: Implement shared bip39 wallet seed for Nano wallet type, although disabled entry for now

* fix: Remove non bip39 seed wallet type from listing

* feat: Implement grouped and single wallets lists in wallets listing page and implement editing and saving group names

* fix: Issue where the ontap always references the leadwallet, also make shared seed wallets section header only display when the multi wallet groups list is not empty

* fix: Add translation and adjust the way the groups display

* feat: Activate bip39 as an option for creating Nano wallet types

* fix: Handle edgecase with creating new wallet with group address, handle case where only bip39 derivation type is allowed with child wallets, activate nano wallet type for shared seed

* chore: Modify the UI to fit adjustment made on figma

* fix: Disposed box triggering error in hive and causing wallet list view to display error

* fix: Switch wallet groups title in wallets list page and also fix issue with renaming groups

* Update lib/reactions/bip39_wallet_utils.dart [skip ci]

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

* Update lib/router.dart [skip ci]

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

* fix: Review fixes: Combine New Wallet Page Type arguments into a single model

* fix: Review fixes: Add failure guard when fetching mnemonic for selected wallet in pre-existing wallets page

* fix: Review fixes - Add loading indicator when mnemonic is being selected for wallet

* fix: Review fixes - Modify variable name to avoid clashes

* fix: Review fixes - Access WalletManager through dependency injection instead of service location

* fix: Review fixes - Add testnet to convertWalletInfoToWalletlistItem function, and adjust according where used

* fix: Review fixes - Add walletPassword to nano, tron and wownero wallets and confirm it is properly handled as it should be

* fix: Remove leadWallet, modify filtering flow to reflect this and not depend on leadWallet, and adjust privacy settings

* fix: Review Fixes - Modify restore flow to reflect current nature of bip39 as default for majority of wallet types

* fix: QA Fixes - Modify preexisting page to display wallet group names if set, and display them in incremental order if not set

* fix: Add wallet group description page and rename pre-existingseeds page to wallet group display page

* fix: Product Fix - Rename pre-existing seeds file name to wallet group display filename

* fix: Product fix - Separate multiwallets groups from single wallets and display separately

* fix - Product Fix - Add empty state for wallet group listing when creating a new wallet, adjust CTAs across buttons relating to the flow also

---------

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

cw_bitcoin_cash/lib/src/bitcoin_cash_wallet_creation_credentials.dart

@@ -2,9 +2,21 @@ import 'package:cw_core/wallet_credentials.dart';
 import 'package:cw_core/wallet_info.dart';
 
 class BitcoinCashNewWalletCredentials extends WalletCredentials {
-  BitcoinCashNewWalletCredentials(
-      {required String name, WalletInfo? walletInfo, String? password, String? passphrase})
-      : super(name: name, walletInfo: walletInfo, password: password, passphrase: passphrase);
+  BitcoinCashNewWalletCredentials({
+    required String name,
+    WalletInfo? walletInfo,
+    String? password,
+    String? passphrase,
+    this.mnemonic,
+    String? parentAddress,
+  }) : super(
+          name: name,
+          walletInfo: walletInfo,
+          password: password,
+          passphrase: passphrase,
+          parentAddress: parentAddress
+        );
+  final String? mnemonic;
 }
 
 class BitcoinCashRestoreWalletFromSeedCredentials extends WalletCredentials {

cw_bitcoin_cash/lib/src/bitcoin_cash_wallet_service.dart

@@ -36,7 +36,7 @@ class BitcoinCashWalletService extends WalletService<
     final strength = credentials.seedPhraseLength == 24 ? 256 : 128;
 
     final wallet = await BitcoinCashWalletBase.create(
-      mnemonic: await MnemonicBip39.generate(strength: strength),
+      mnemonic: credentials.mnemonic ?? await MnemonicBip39.generate(strength: strength),
       password: credentials.password!,
       walletInfo: credentials.walletInfo!,
       unspentCoinsInfo: unspentCoinsInfoSource,