feat: add blockchain status getter to all daemons

lib/plugins/wallet/litecoind/litecoind.js

@@ -118,11 +118,18 @@ function supportsBatching (cryptoCode) {
     .then(() => SUPPORTS_BATCHING)
 }
 
+function checkBlockchainStatus (cryptoCode) {
+  return checkCryptoCode(cryptoCode)
+    .then(() => fetch('getblockchaininfo'))
+    .then(res => !!res['initialblockdownload'] ? 'ready' : 'syncing')
+}
+
 module.exports = {
   balance,
   sendCoins,
   newAddress,
   getStatus,
   newFunding,
-  supportsBatching
+  supportsBatching,
+  checkBlockchainStatus
 }