title: DB transaction using R2BC Kotlin coroutine
body: <p>I using R2bc in Spring Webflux project with Kotlin. It is working nicely. But I have this method</p>
  
  <pre><code>@Component
  class UserRepository(private val client: DatabaseClient, private val operator: TransactionalOperator) {
  
      suspend fun updateUser(user: User, value: String): Int {
  
          client.execute("INSERT INTO log(user_id, activity) VALUES (:user_id, :activity)")
                .bind("activity", user.activity)
                .bind("user_id", user.id)
                .fetch()
                .awaitRowsUpdated()
  
          return client.execute("UPDATE users SET value = :value WHERE id = :id")
                       .bind("value", value)
                       .bind("id", user.id)
                       .fetch()
                       .awaitRowsUpdated()
  }
  </code></pre>
  
  <p>This method is working but I would like to use DB transaction. Is it supported in Kotlin.</p>