Implement Couch Search and Request Batching (#3798)

* Implemented search in couch provider

* Promises, not await

* Batch requests

* Only batch if > 1

* Remove legacy Couch adapter

* Cleaned up couch request batching code

* Added test cases

* Code cleanup

* Changes to new and legacy objects API to remove redundant persists due to mutation of modified and persisted timestamps

* Cleaned up couch unit tests

Co-authored-by: Shefali Joshi <simplyrender@gmail.com>

src/api/objects/ObjectAPI.js

@@ -520,8 +520,10 @@ ObjectAPI.prototype.getOriginalPath = function (identifier, path = []) {
  */
 
 function hasAlreadyBeenPersisted(domainObject) {
-    return domainObject.persisted !== undefined
-        && domainObject.persisted === domainObject.modified;
+    const result = domainObject.persisted !== undefined
+        && domainObject.persisted >= domainObject.modified;
+
+    return result;
 }
 
 export default ObjectAPI;