feat: implement heal channel mechanism for admin-ahm communication

- Add global unbounded channel in common crate for heal requests
- Implement channel processor in ahm to handle heal commands
- Add Start/Query/Cancel commands support via channel
- Integrate heal manager initialization in main.rs
- Replace direct MRF calls with channel-based heal requests in ecstore
- Support advanced heal options including pool_index and set_index
- Enable admin handlers to send heal requests via channel

crates/common/src/lib.rs

@@ -15,6 +15,7 @@
 pub mod bucket_stats;
 // pub mod error;
 pub mod globals;
+pub mod heal_channel;
 pub mod last_minute;
 
 // is ','