refactor(wallet2): async job for fetching crypto services moved to buy/sell controller

Async task for fetching crypto services is temporary moved because of other
changes we need to apply during the refactor phase. It will be moved to
appropriate service at the end.

src/app/wallet/v2/views/buy_sell_crypto/service_controller.nim

@@ -3,11 +3,28 @@ import NimQml, json, strutils, chronicles
 import service_model, service_item
 
 import ../../../../../app_service/[main]
+import ../../../../../app_service/tasks/[qt, threadpool]
 import status/[status, wallet2]
+import status/statusgo_backend/wallet as status_wallet
 
 logScope:
   topics = "app-wallet2-crypto-service"
 
+#################################################
+# Async request for the list of services to buy/sell crypto
+#################################################
+
+const asyncGetCryptoServicesTask: Task = proc(argEncoded: string) {.gcsafe, nimcall.} =
+  let arg = decode[QObjectTaskArg](argEncoded)
+  var success: bool
+  let response = status_wallet.fetchCryptoServices(success)
+
+  var list: JsonNode
+  if(success):
+    list = response.parseJson()["result"]
+
+  arg.finish($list)
+
 QtObject:
   type CryptoServiceController* = ref object of QObject
     status: Status
@@ -37,11 +54,28 @@ QtObject:
   QtProperty[QVariant] cryptoServiceModel:
     read = getCryptoServiceModel
 
+  #################################################
+  # This part is moved here only cause we want to get rid of it from the `app_service`
+  # This will be done in appropriate refactored service, the same way as async things are done
+  # in other services.
+  proc onAsyncFetchCryptoServices*(self: CryptoServiceController, response: string) {.slot.} =
+    self.status.wallet2.onAsyncFetchCryptoServices(response)
+
+  proc asyncFetchCryptoServices*(self: CryptoServiceController) =
+    ## Asynchronous request for the list of services to buy/sell crypto.
+    let arg = QObjectTaskArg(
+      tptr: cast[ByteAddress](asyncGetCryptoServicesTask),
+      vptr: cast[ByteAddress](self.vptr),
+      slot: "onAsyncFetchCryptoServices"
+    )
+    self.appService.threadpool.start(arg)
+  #################################################
+
   proc fetchCryptoServicesFetched*(self:CryptoServiceController) {.signal.}
 
   proc fetchCryptoServices*(self: CryptoServiceController) {.slot.} =
     if(not self.servicesFetched):
-      self.appService.walletService.asyncFetchCryptoServices()
+      self.asyncFetchCryptoServices()
     else:
       self.fetchCryptoServicesFetched()