Add structured coroutines and explicit error handling

examples/http_server.gt

@@ -36,18 +36,6 @@ class EpicControllerImpl(val db: *bun.DB) {
     }
 }
 
-worker Counter {
-    var counter = 0
-
-    fun getCount(): Int {
-        return counter
-    }
-    fun increment() {
-        counter += 1
-        println(counter)
-    }
-}
-
 fun main() {
     val postgresDsn = "postgresql://postgres:postgres@localhost/postgres?sslmode=disable"
     val sqlDb = sql.OpenDB(
@@ -56,21 +44,10 @@ fun main() {
         )
     )
     val db = bun.NewDB(sqlDb, pgdialect.New())
-    val counter = Counter()
-    go {
-        while(true) {
-        select {
-            every(1000) -> counter.increment()
-        }
-    }
-    }
     val epicController = EpicControllerImpl(db)
     fmt.Println("serving http://localhost:8080")
     http.HandleFunc("/", epicController.hello)
     http.HandleFunc("/bun", epicController.bunHealth)
     http.HandleFunc("/bun/users", epicController.bunUsers)
-    http.HandleFunc("/counter") { w, r ->
-        fmt.Fprintln(w, "bun users total:", counter.getCount())
-    }
     http.ListenAndServe(":8080", http.DefaultServeMux)
 }