fix: add stream fields allow_direct and mirror_direct

[djcarpe]

When updating a stream that has allow_direct stream set to true will overwrite it within the server to false. It was a rather unexpected behavior. If there is a better way to implement this, please let me know. Thanks!

[djcarpe]

Adding an issue #162

[djcarpe]

And finally an example using my fork that does not override fields.

Untitled notebook

Mix.install([
  {:gnat, git: "https://github.com/djcarpe/nats.ex", tag: "0.00"}
])

Section

{:ok, conn} = Gnat.start_link(%{host: ~c"127.0.0.1", port: 4222})

{:ok, info} = Gnat.Jetstream.API.Stream.info(conn, "test")

config = info.config |> Map.put(:max_age, 130_000_000_000)

{:ok, _} = Gnat.Jetstream.API.Stream.update(conn, config)

[mmmries]

these changes look spot on. I'm not sure why the update would have affected those fields if our code wasn't even trying to send them (maybe there's a different default for update than for create?), but either way being explicitly aware of the flags and sending the values from the user is the right thing to do. Thanks!

[mmmries]

I've released this change in the 1.8.4 version https://github.com/nats-io/nats.ex/releases/tag/v1.8.4