[FEATURE-REQUEST] Allow to {:ok, conn} on `action` in any `resource_actions` to support redirect somewhere else

**Describe the problem you're proposing to solve**

So I have a action in `resource_actions` that requires redirect to some internal page after performing the action

```
def resource_actions(_conn) do
[
approve_move_to_next: %{
name: "Approve product and redirect somewhere",
action: fn conn, product ->
Product.approve(product)
redirect(conn, to: somewhere_internal_url)
end,
},
]
end
```

However `action` only accepts `{:ok, record} | {:error, changeset} | {:error, record, custom_error}` as a return value, and if you modify with the `conn` it will successfully redirect but raise an error something like

```
09:06:30.980 [error] Ranch listener SkyeWeb.Endpoint.HTTPS had connection process started with :cowboy_tls:start_link/4 at #PID<0.1179.0> exit with reason: {{:badmatch, :undefined}, [{:cow_http2_machine, :prepare_headers, 5, [file: '/Users/ryvasquez/Documents/apps/sample_app/deps/cowlib/src/cow_http2_machine.erl', line: 1119]}, {:cowboy_http2, :send_response, 5, [file: '/Users/ryvasquez/Documents/apps/sample_app/deps/cowboy/src/cowboy_http2.erl', line: 790]}, {:cowboy_http2, :commands, 3, [file: '/Users/ryvasquez/Documents/apps/sample_app/deps/cowboy/src/cowboy_http2.erl', line: 664]}, {:cowboy_http2, :loop, 2, [file: '/Users/ryvasquez/Documents/apps/sample_app/deps/cowboy/src/cowboy_http2.erl', line: 277]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 240]}]}
```

**Describe the solution you'd like**

Maybe we can pattern match a `Plug.Conn` in this part
https://github.com/aesmail/kaffy/blob/c0b16cafe085638e198c7a4ad3e3afe0c31a2076/lib/kaffy_web/controllers/resource_controller.ex#L326-L337

and return as is since it was a conn.

Let me know if this is a valid solution, Im happy to work on it 👍

**Describe alternatives you've considered**

**Additional context**
Add any other context or screenshots about the feature request here.