Add a way to chose the component storage type from scripting.

[AndreaCatania]

Add a way to chose the component storage type from scripting.

Each component can have different storages:

• DenseVectorStorage stores the components in a condensed vector.
• BatchDesenseVectorStorage can store more components per each entity, in a condensed vector.

You can:

• Find the batch storage documentation here: Event mechanism #29
• See an example: https://github.com/GodotECS/godex/blob/main/tests/test_ecs_system.h#L465-L493

[AndreaCatania]

Moving the proposal to discussions to keep the issue just for things to fix.