Add Nginx component ID to main repo (#4397)

* Add Nginx component ID to main repo

* Update LUA as a separated part.

* Update doc.

oap-server/server-bootstrap/src/main/resources/component-libraries.yml

@@ -276,7 +276,6 @@ AvroClient:
   id: 83
   languages: Java
 
-
 # .NET/.NET Core components
 # [3000, 4000) for C#/.NET only
 AspNetCore:
@@ -352,6 +351,12 @@ ServiceCombServiceCenter:
   id: 5002
   languages: Golang
 
+# Lua components
+# [6000, 7000) for Lua agent
+Nginx:
+  id: 6000
+  languages: Lua
+
 # Component Server mapping defines the server display names of some components
 # e.g.
 # Jedis is a client library in Java for Redis server