mobile: add host mode in NetCfg (#933)

apps/android/app/src/main/java/chat/simplex/app/model/SimpleXAPI.kt

@@ -1293,6 +1293,8 @@ class ArchiveConfig(val archivePath: String, val disableCompression: Boolean? =
 @Serializable
 data class NetCfg(
   val socksProxy: String? = null,
+  val hostMode: HostMode = HostMode.OnionViaSocks,
+  val requiredHostMode: Boolean = false,
   val tcpConnectTimeout: Long, // microseconds
   val tcpTimeout: Long, // microseconds
   val tcpKeepAlive: KeepAliveOpts?,
@@ -1322,6 +1324,13 @@ data class NetCfg(
   }
 }
 
+@Serializable
+enum class HostMode {
+  @SerialName("onionViaSocks") OnionViaSocks,
+  @SerialName("onion") Onion,
+  @SerialName("public") Public;
+}
+
 @Serializable
 data class KeepAliveOpts(
   val keepIdle: Int, // seconds