Unistore: Batch write events (#101381)

* Batch write events

* Improve instrumentation

* Measure batch phases

* Detect lock contention

* remove the execBatch goroutine

* removing tracing prefix

* detect context cancel

* batch channel map

pkg/storage/unified/sql/data/resource_update.sql

@@ -3,7 +3,8 @@ UPDATE {{ .Ident "resource" }}
         {{ .Ident "guid" }}   = {{ .Arg .GUID }},
         {{ .Ident "value" }}  = {{ .Arg .WriteEvent.Value }},
         {{ .Ident "folder" }}  = {{ .Arg .Folder }},
-        {{ .Ident "action" }} = {{ .Arg .WriteEvent.Type }}  
+        {{ .Ident "action" }} = {{ .Arg .WriteEvent.Type }},
+        {{ .Ident "resource_version" }} = {{ .Arg .ResourceVersion }}
     WHERE 1 = 1
         AND {{ .Ident "group" }}     = {{ .Arg .WriteEvent.Key.Group }}
         AND {{ .Ident "resource" }}  = {{ .Arg .WriteEvent.Key.Resource }}