CW-525-Add-Tron-Wallet (#1327)

* chore: Initial setup for Tron Wallet

* feat: Create Tron Wallet base flow implemented, keys, address, receive, restore and proxy classes all setup

* feat: Display seed and key within the app

* feat: Activate restore from key and seed for Tron wallet

* feat: Add icon for tron wallet in wallet listing page

* feat: Activate display of receive address for tron

* feat: Fetch and display tron balance, sending transaction flow setup, fee limit calculation setup

* feat: Implement sending of native tron, setup sending of trc20 tokens

* chore: Rename function

* Delete lib/tron/tron.dart

* feat: Activate exchange for tron and its tokens, implement balance display for trc20 tokens and setup secrets configuration for tron

* feat: Implement tron token management, add, remove, delete, and get tokens in home settings view, also minor cleanup

* feat: Activate buy and sell for tron

* feat: Implement restore from QR, transactions history listing for both native transactions and trc20 transactions

* feat: Activate send all and do some minor cleanups

* chore: Fix some lint infos and warnings

* chore: Adjust configurations

* ci: Modify CI to create and add secrets for node

* fix: Fixes made while self reviewing the PR for this feature

* feat: Add guide for adding new wallet types, and add fixes to requested changes

* fix: Handle exceptions gracefully

* fix: Alternative for trc20 estimated fee

* fix: Fixes to display of amount and fee, removing clashes

* fix: Fee calculation WIP

* fix: Fix issue with handling of send all flow and display of amount and fee values before broadcasting transaction

* fix: PR review fixes and fix merge conflicts

* fix: Modify fetching assetOfTransaction [skip ci]

* fix: Move tron settings migration to 33

lib/entities/preferences_key.dart

@@ -14,6 +14,7 @@ class PreferencesKey {
   static const currentFiatCurrencyKey = 'current_fiat_currency';
   static const currentBitcoinCashNodeIdKey = 'current_node_id_bch';
   static const currentSolanaNodeIdKey = 'current_node_id_sol';
+  static const currentTronNodeIdKey = 'current_node_id_trx';
   static const currentTransactionPriorityKeyLegacy = 'current_fee_priority';
   static const currentBalanceDisplayModeKey = 'current_balance_display_mode';
   static const shouldSaveRecipientAddressKey = 'save_recipient_address';