Cw 565 sign messages (#1378)

* version bump to 3.13.9, auth working on mac

* bump flutter version in workflow file

* workflow fix

* test fix

* downgrade flutter version

* test fix

* test fix

* update gradle version

* start working on ui for message signing

* updates

* sign working for a few wallet types

* updates & verification for electrum currencies

* nano support

* sign/verify working on eth, bitcoin broken

* update translations

* Implement Verify Message for Monero

* save [skip ci]

* pub key extraction working

* fixes for electrum signing

* verify working for solana!

* electrum still not working :( [skip ci]

* electrum messages working!

* fixes for updated dart version, localization file updates

* remove accidental inclusion

* missed some unimplemented throws

* Update res/values/strings_de.arb

Co-authored-by: Konstantin Ullrich <konstantinullrich12@gmail.com>

* Apply suggestions from code review

Co-authored-by: Konstantin Ullrich <konstantinullrich12@gmail.com>

* review suggestions and updates [skip ci]

* [skip ci] add polygon

* [skip ci] merge mac-auth/update version

* fix litecoin

* bio auth mac fix

* remove comment and change duration from 2 to 0

* cherry pick previous changes

* litecoin fixes, sign form fixes, use new walletAddressPicker

* support accounts

* verify messages working for monero

* working sign and verify messages for nano

* electrum signing working [skip ci]

* additional nano fixes

* update translations

* attempt to decode signatures with base64

* workaround for secure storage bug on mac

* bump version to 3.19.5 (because breez will need this version anyways)

* some code cleanup

* some changess didn't get saved

* just documenting the issue [skip ci]

* undo accidental removal + minor code cleanup

* merge conflicts

* merge fixes [skip ci]

* add tron support

* [wip] fixing

* remove duplicate references to electrum path for maintainability

* fixes

* minor fix

* fixes

* undo debug comment

* update migration for all electrum based wallets

* hotfixes

* copy over the rest of the fixes

* minor code cleanup [skip ci]

* updates

* electrum signing workinggit statusgit statusgit statusgit status!

* copy same fixes for litecoin

* litecoin fixes

* add v to litecoin signatures

* fix dependencies

* fix bitcoin_base version

* merge fix

* dep override

* fix conflicts with main

* trial fix for android build

* fixes

* fix

* dep fix, should build

* fix signing for bitcoin cash

* [skip ci] minor code cleanup

* [skip ci] minor code cleanup 2

* forgot wonero, various other fixes

* more fixes

* fix solana (untested)

---------

Co-authored-by: Konstantin Ullrich <konstantinullrich12@gmail.com>
Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

cw_core/lib/wallet_base.dart

@@ -69,7 +69,6 @@ abstract class WalletBase<BalanceType extends Balance, HistoryType extends Trans
 
   int calculateEstimatedFee(TransactionPriority priority, int? amount);
 
-
   // void fetchTransactionsAsync(
   //     void Function(TransactionType transaction) onTransactionLoaded,
   //     {void Function() onFinished});
@@ -92,7 +91,9 @@ abstract class WalletBase<BalanceType extends Balance, HistoryType extends Trans
 
   Future<void> renameWalletFiles(String newWalletName);
 
-  Future<String> signMessage(String message, {String? address = null}) => throw UnimplementedError();
+  Future<String> signMessage(String message, {String? address = null});
+
+  Future<bool> verifyMessage(String message, String signature, {String? address = null});
 
   bool? isTestnet;
 }