bug#43725: 28.0.50; Include feature/native-comp into master

[Eli Zaretskii]

We have the command byte-compile-file, but we don't have its
equivalent native-compile command.  Should we have a
native-compile-file command?  I think we should, and I think it
should run synchronously, like byte-compile-file, i.e. it should run
the compilation in the Emacs session where the command was invoked,
not in a subprocess.

WDYT?