Add telemetry_options passed to dataloader and ecto

[arnodirlam]

Currently, queries run by dataloader happen under the hood without the ability to pass additional options to them.

It should be possible to do this

1. when calling the Dx API

   Dx.Defd.load!(..., telemetry_options: [...])

2. globally and dynamically

   config :dx telemetry_options: &MyApp.Dx.Config.telemetry_options/1
   
   defmodule MyApp.Dx.Config do
     def telemetry_options(atom) do
       [
         logger_metadata: Logger.metadata()
       ]
     end
   end