no_std bevy example

[BenjaminBrienen]

Tested with my demo UEFI application and confirmed it works as expected, letting me derive Reflect and query for type information at runtime. CI task has been updated to ensure bevy_reflect will continue to compile. I have noticed that because bevy_reflect has a lot of macros, and they aren't checked at compile time in the crate that defines them (only at the compile time of the crate that uses them) we'll probably want to add a no_std example to Bevy to really ensure everything works as expected for end users.

Originally posted by @bushrat011899 in #16256 (comment)