Convert API clients to kotlin (commons-app#5567)

* Convert UserClient to kotlin

* Added tests for WikiBaseClient

* Removed superfluous dao tests in review helper and got the proper ReviewDaoTest running in the unit test suite

* Improved tests for ReviewHelper

* Convert the ReviewHelper to kotlin

* Convert the WikiBaseClient to kotlin

* Convert the WikidataClient to kotlin

Author: psh

app/src/androidTest/java/fr/free/nrw/commons/ReviewDaoTest.java

@@ -0,0 +1,36 @@
+package fr.free.nrw.commons.mwapi
+
+import fr.free.nrw.commons.utils.DateUtil
+import fr.free.nrw.commons.wikidata.mwapi.MwQueryResponse
+import fr.free.nrw.commons.wikidata.mwapi.MwQueryResult
+import fr.free.nrw.commons.wikidata.mwapi.UserInfo
+import io.reactivex.Single
+import java.text.ParseException
+import java.util.Date
+import javax.inject.Inject
+
+class UserClient @Inject constructor(private val userInterface: UserInterface) {
+    /**
+     * Checks to see if a user is currently blocked from Commons
+     *
+     * @return whether or not the user is blocked from Commons
+     */
+    fun isUserBlockedFromCommons(): Single<Boolean> =
+        userInterface.getUserBlockInfo()
+            .map(::processBlockExpiry)
+            .single(false)
+
+    @Throws(ParseException::class)
+    private fun processBlockExpiry(response: MwQueryResponse): Boolean {
+        val blockExpiry = response.query()?.userInfo()?.blockexpiry()
+        return when {
+            blockExpiry.isNullOrEmpty() -> false
+            "infinite" == blockExpiry -> true
+            else -> {
+                val endDate = DateUtil.iso8601DateParse(blockExpiry)
+                val current = Date()
+                endDate.after(current)
+            }
+        }
+    }
+}