Add basic serialization to the ECS

[robertgoss]

It would be usefulto beable to dump and load the scene.

We add the ability to dump and load the scene from json. We use python's json library to do this (for now) and add methods to dump / load objects to a python object which can then be dumped / loaded.

[thomas-gale]

Very good idea @robertgoss!

I'll create a task for me to write some tests in the future #26

[thomas-gale]

Ah looks like a few issues have crept in merging main, let me take a look

[thomas-gale]

% magic run test 
Task 'setup' can be skipped (cache hit) 🚀
Included from /Users/galet/dev/mo3d/src/mo3d/ecs/__init__.mojo:1:
/Users/galet/dev/mo3d/src/mo3d/ecs/component_store.mojo:362:64: error: invalid call to 'aabb': could not deduce parameter 'T' of callee 'aabb'
                        store.geometry_components[geom_id].aabb())
                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
Included from /Users/galet/dev/mo3d/src/mo3d/ecs/__init__.mojo:1:
/Users/galet/dev/mo3d/src/mo3d/ecs/component_store.mojo:362:64: note: failed to infer parameter 'T', parameter isn't used in any argument
                        store.geometry_components[geom_id].aabb())
                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
Included from /Users/galet/dev/mo3d/src/mo3d/geometry/__init__.mojo:1:
/Users/galet/dev/mo3d/src/mo3d/geometry/geometry.mojo:80:8: note: function declared here
    fn aabb[T: DType, dim: Int](self) -> AABB[T, dim]:
       ^
/Users/galet/dev/mo3d/.magic/envs/default/bin/mojo: error: failed to parse the provided Mojo source module

[thomas-gale]

The error is resolved.