feat: add access policy middleware support cidr block

docs/middleware/access-policy.md

@@ -13,7 +13,7 @@ It supports two actions: `ALLOW` and `DENY`.
 ### How It Works
 1. **Define an action:** Specify whether the middleware should `ALLOW` or `DENY` access.
 
-2. **Set sourceRanges:** Provide a list of IP addresses or IP ranges to which the policy applies. 
+2. **Set sourceRanges:** Provide a list of IP addresses, IP ranges or a CIDR block to which the policy applies. 
 
     Requests originating from these sources will be evaluated according to the specified action.
 
@@ -28,5 +28,6 @@ middlewares:
       action: DENY # Specify either DENY or ALLOW
       sourceRanges:
         - 192.168.1.1 # Single IP address
-        - 172.18.0.0-172.18.0.10 # IP range
+        - 10.42.1.1-10.42.1.100 # IP range
+        - 10.42.1.1/16 # CIDR block
 ```