core: initial api support for items around a given item (#5092)

* core: initial api support for items around a given item

* implementation and tests for local messages

* pass entities down

* unused

* getAllChatItems implementation and tests

* pagination for getting chat and tests

* remove unused import

* group implementation and tests

* refactor

* order by created at for local and direct chats

src/Simplex/Chat/Controller.hs

@@ -839,6 +839,7 @@ data ChatPagination
   = CPLast Int
   | CPAfter ChatItemId Int
   | CPBefore ChatItemId Int
+  | CPAround ChatItemId Int
   deriving (Show)
 
 data PaginationByTime
@@ -1010,7 +1011,7 @@ defaultSimpleNetCfg =
       smpWebPort = False,
       tcpTimeout_ = Nothing,
       logTLSErrors = False
-    }  
+    }
 
 data ContactSubStatus = ContactSubStatus
   { contact :: Contact,