refactor(targets): unify endpoint source/merge logic and bump rustfs-kafka-async to v1.2.0 (#2654)

Co-authored-by: Filipe Monteiro <a22407332@alunos.ulht.pt>
Co-authored-by: cxymds <Cxymds@qq.com>
Co-authored-by: weisd <im@weisd.in>
Co-authored-by: loverustfs <hello@rustfs.com>

crates/targets/Cargo.toml

@@ -33,6 +33,7 @@ url = { workspace = true }
 urlencoding = { workspace = true }
 uuid = { workspace = true, features = ["v4", "serde"] }
 sysinfo = { workspace = true, features = ["multithread"] }
+rustfs-kafka-async = { workspace = true }
 
 [dev-dependencies]
 criterion = { workspace = true }