feature request: typed external storage API

[alissa-tung]

Thank you for developing react-resizable-panels! The library is easy to use and comprehensively documented with examples.

We had already had external layout storage for panel groups. That is,

export type PanelGroupStorage = {
    getItem(name: string): string | null;
    setItem(name: string, value: string): void;
};

I want to suggest two features request here:

• seems that the PanelGroupStorage is initially for multiple groups use one storage together, so that, the API is used with names. When using <PanelGroup autoSaveId="example" direction="horizontal" storage={urlStorage}>, the storage API should had already able to figure out which name is the group, for it is assigned as the creation of <PanelGroup/>.
• the getItem and setItem all use string. An example of storage item would like {"left-panel,main-panel,right-panel":{"expandToSizes":{},"layout":[25,50,25]}}, I guess this is generate from object, so that we can make the two APIs typed

[bvaughn]

This library normally uses the browser's built-in localStorage API for saving layouts. That can be overridden with an object that has the same API as localStorage (strings in and out).

I don't see a reason to add a different API abstraction in between the two, so this doesn't sound like a feature that I'm interested in building.

If you want to share more thoughts about why you would want this change, I will read and consider them, but for now I'm going to close this as it's not something I'm interested in doing.

Thanks for understanding 🙇🏼