Fix registering all reflection types that are components as reflection components

[anlumo]

Objective

Fixes #16659

Solution

• I just added all the #[reflect(Component)] attributes where necessary.

Testing

I wrote a small program that scans the bevy code for all structs and enums that derive Component and Reflect, but don't have the attribute #[reflect(Component)].

I don't know if this testing program should be part of the testing suite of bevy. It takes a bit of time to scan the whole codebase. In any case, I've published it here.

[BD103]

Looks good!

[MrGVSV]

That's a neat program! We'd love to do something similar for the Bevy linter if you’re ever interested in helping there :)