core: convert single-field to tagged JSON encoding (#3183)

* core: convert single-field to tagged JSON encoding

* rename

* rename

* fixes, test

* refactor

tests/Test.hs

@@ -5,6 +5,7 @@ import ChatTests
 import ChatTests.Utils (xdescribe'')
 import Control.Logger.Simple
 import Data.Time.Clock.System
+import JSONTests
 import MarkdownTests
 import MobileTests
 import ProtocolTests
@@ -22,6 +23,7 @@ main = do
   withGlobalLogging logCfg . hspec $ do
     describe "Schema dump" schemaDumpTest
     describe "SimpleX chat markdown" markdownTests
+    describe "JSON Tests" jsonTests
     describe "SimpleX chat view" viewTests
     describe "SimpleX chat protocol" protocolTests
     describe "WebRTC encryption" webRTCTests