feat: command buffer

[krispya]

In order to fully decouple the different internal domains, I wanted to explore implementing command buffers. But also this lays the groundwork for MT since workers can enqueue commands and a scheduler can execute all commands in batch, in the order they were enqueued.

Here are the initial notes:

• Parse arguments (single trait or multiple, etc).
• Enqueue an "Add" command for each trait.
• Flush the command buffer immediately as it is synchronous.
• A separate commit routine runs when the command buffer is flushed and runs commitAdd.
• This collects all the add commands together and batch updates the stores, reducing the need to loop. (Different store strategies can be added here, for example archetypes.)
• When stores are updated, a store update event is emitted (maybe different depending on the update?).
• A query routine listens for this event and updates the query's cache.
• An Added event is emitted for userland listeners.

Add command gets enqueued -> Add command gets committed -> world entity-trait tables update -> table update events emit -> queries listen to this and update synchronously -> userland add events emit