Fix media stream hooks

[DrFlowerkick]

No description provided.

[DrFlowerkick]

One question regarding use_user_media:

Effect::watch(
    move || enabled.get(),
    move |enabled, _, _| {
        if *enabled {
            leptos::task::spawn_local({
                #[cfg(not(feature = "ssr"))]
                let _start = _start.clone();

                async move {
                    _start().await;
                }
            });
        } else {
            _stop();
        }
    },
    true,
);

As far as I understand, a leptos Effect is only executed inside the reactive system on client side. Therefore we do not need to check #[cfg(not(feature = "ssr"))], correct?

[DrFlowerkick]

I suggest some rework of the API of these hooks:

1. Remove enabled form UseUserMediaOptions. We can create a enabled signal inside the hook and return it.
2. Add bool immediate variable to UseUserMediaOptions to start the stream immediately.
3. Remove set_enabled from UseUserMediaReturn. The hook provides start and stop to control the stream.
4. Add a stream source variable to UseUserMediaOptions. The examples of both hooks show, that a source has to be attached to the stream. I suggest to include this to the hook API for better usability.

[maccesch]

Thank you!

I suggest some rework of the API of these hooks:

1. Remove `enabled` form `UseUserMediaOptions`. We can create a `enabled` signal inside the hook and return it.

Answered in Discord.

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2. Add bool `immediate` variable to `UseUserMediaOptions` to start the stream immediately.

I'm a bit torn with this one... we have a few other hooks that use this kind of options.
But then again, this is already possible with providing the enabled option as true.

---

3. Remove `set_enabled` from `UseUserMediaReturn`. The hook provides `start` and `stop` to control the stream.
4. Add a stream source variable to `UseUserMediaOptions`. The examples of both hooks show, that a source has to be attached to the stream. I suggest to include this to the hook API for better usability.

Both also answered in Discord.