Apply LUA api providers before loading script.

[ConnorBP]

Fixes issue where api is not available during script initialization. #97

PR is not yet complete. There is still a callback error caused by: error converting Lua nil to userdata to investigate which happens when the api function is called.

[ConnorBP]

Found what is causing the NIL error. It happened upon fetching the bevy "world" from globals. It is not set on script load execution, only after event execution is fired. This makes it so that any API function which accesses world state cannot be used during script load. To fix this requires a refactor involving changing the script_add_synchronizer into an exclusive system with a SystemState

[ConnorBP]

Update: the other issues have their own concerns that should be in another PR. But the api registration issue is solved by this PR and should be considered Complete.

I will open a different PR for potential api refactoring for connecting callback functions with event signals.

[makspll]

Looks good, just one small nit

[ConnorBP]

Looks good, just one small nit

`providers.attach_all()' requires a mutex as it's argument.

Also get_mut is describes as follows:
`
Returns a mutable reference to the underlying data.

Since this call borrows the Mutex mutably, no actual locking needs to take place -- the mutable borrow statically guarantees no locks exist.
`
So it should not be an issue

[makspll]

Sounds good, let's just fix CI and happy to merge (rustfmt not aarch64, that should fail)

[ConnorBP]

It worked it looks like... but then failed to cache?