Rename NativeFunc to TypedFunction

[silwol]

Description

Review

• Add a short description of the change to the CHANGELOG.md file

[syrusakbary]

We need to still make NativeFunc type alias work (in case someone wants to import, we should just show a deprecation warning)

[silwol]

@syrusakbary It should work, see lib/api/src/js/mod.rs:87 and lib/api/src/sys/mod.rs:132.

I initially put the aliases directly next to the structs, but that caused a compiler warning when re-exporting them inside {sys,js}/mod.rs, so I moved the alias there instead of the re-export. The public API should work like before if I'm not completely wrong, because the sys::native and js::native mods are not directly visible to users of the API.