[Feature] Nacos3 support

**What would you like to be added**:
1. Support Nacos3 to be a kind of discovery.
2. Using fuzzy subscribe to list-watch rules.

**Why is this needed**:
Nacos3 is using widely nowadays, we need to add nacos 3 support for more users.

The issue requests Nacos3 discovery support and fuzzy subscription for list-watch rules, but names no files, tests, or entry points. Start by locating the existing discovery integration and list-watch handling, then define done as Nacos3 discovery and fuzzy subscriptions working with appropriate verification.

Written by the indexing model from the issue text.