PLT-4535/PLT-4503 Fix inactive users in searches and add option functionality to DB user search (#4413)

* Add options to user database search

* Fix inactive users showing up incorrectly in some user searches

* Read JSON for searchUsers API into anonymous struct

* Move anonymous struct to be a normal struct in model directory and upadte client to use it

* Added clarification comment about slightly odd query condition in search

webapp/utils/constants.jsx

@@ -181,6 +181,10 @@ export const UserStatuses = {
     ONLINE: 'online'
 };
 
+export const UserSearchOptions = {
+    ALLOW_INACTIVE: 'allow_inactive'
+};
+
 export const SocketEvents = {
     POSTED: 'posted',
     POST_EDITED: 'post_edited',
@@ -214,6 +218,7 @@ export const Constants = {
     ActionTypes,
     WebrtcActionTypes,
     UserStatuses,
+    UserSearchOptions,
     TutorialSteps,
 
     PayloadSources: keyMirror({