Draft: Resolve #3529964 "Support fieldvalue pairs"

Closes #3529964

src/ContentfulApi.php

@@ -92,8 +92,15 @@ class ContentfulApi {
     try {
       $query = new Query();
       $query->setContentType($contentTypeId);
-      foreach ($queryParams as $key => $value) {
-        $query->$key($value);
+      foreach ($queryParams as $key => $values) {
+        if (is_array($values)) {
+          foreach ($values as $field => $value) {
+            $query->$key($field, $value);
+          }
+        }
+        else {
+          $query->$key($values);
+        }
       }
       $entries = $this->getclient()->getEntries($query);
     }