Add the Reflect and/or Inspectable traits to tilemap structs so we can use them nicely with egui_inspector

[dh7892]

As the title suggests.

I'm pretty new to Rust and very new to Bevy and even newer to becy_ecs_tilemap. But I've been playing around with it for a few days.

To help be work out what's what, I've been using bevy-inspector-egui. However, it won't automatically let me see details of the components that belong to the bevy_ecs_tilemap crate because they haven't got Reflect or Inspect implemented.

It might be nice if you derived those traits for people to use with the inspector-egui, which I believe is pretty popular,

Thanks

[StarArawn]

Please add this as an issue. We should probably hide it under a feature flag.

[dh7892]

Done: #412