docs: add security settings and builtin security reference

ydb/docs/ru/core/_includes/builtin-groups-graph.md

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+```mermaid
+---
+config:
+  layout: elk
+  elk:
+    mergeEdges: true
+    nodePlacementStrategy: NETWORK_SIMPLEX
+---
+graph BT
+
+DATA-WRITERS & DATABASE-ADMINS --> ADMINS
+DDL-ADMINS & ACCESS-ADMINS --> DATABASE-ADMINS
+DATA-READERS --> DATA-WRITERS
+METADATA-READERS --> DATA-READERS & DDL-ADMINS
+%%USERS --> METADATA-READERS & DATA-READERS & DATA-WRITERS & DDL-ADMINS & ACCESS-ADMINS & DATABASE-ADMINS & ADMINS
+USERS --> METADATA-READERS & DDL-ADMINS & ACCESS-ADMINS
+
+    DATA-READERS["<b>DATA-READERS</b>
+    +SelectRow"]
+
+    DATA-WRITERS["<b>DATA-WRITERS</b>
+    +UpdateRow
+    +EraseRow"]
+
+    METADATA-READERS["<b>METADATA-READERS</b>
+    +DescribeSchema
+    +ReadAttributes"]
+
+    DATABASE-ADMINS["<b>DATABASE-ADMINS</b>
+    +CreateDatabase
+    +DropDatabase"]
+
+    ACCESS-ADMINS["<b>ACCESS-ADMINS</b>
+    +GrantAccessRights"]
+
+    DDL-ADMINS["<b>DDL-ADMINS</b>
+    +CreateDirectory
+    +CreateTable
+    +CreateQueue
+    +WriteAttributes
+    +AlterSchema
+    +RemoveSchema"]
+
+    USERS[<b>USERS</b>]
+    ADMINS[<b>ADMINS</b>]
+```
+
+[//]: # (diplodoc support for mermaid lacks support for markdown in labels)