Add native-deb* targets to build native Debian packages

In continuation of previous #13451, this commits adds native-deb*
targets for make to build native debian packages. Github workflows
are updated to build and test native Debian packages.

Native packages only build with pre-configured paths (see the
dh_auto_configure section in contrib/debian/rules.in). While
building native packages, paths should not be configured. Initial
config flags e.g. '--enable-debug' are replaced in
contrib/debian/rules.in.

Additional packages on top of existing zfs packages required to
build native packages include debhelper-compat, dh-python, dkms,
po-debconf, python3-all-dev, python3-sphinx.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Umer Saleem <usaleem@ixsystems.com>
Closes #14265

configure.ac

@@ -32,6 +32,7 @@
 
 AC_INIT(m4_esyscmd(awk '/^Name:/ {printf $2}' META),
 	m4_esyscmd(awk '/^Version:/ {printf $2}' META))
+CFGOPTS="$*"
 AC_LANG(C)
 ZFS_AC_META
 AC_CONFIG_AUX_DIR([config])
@@ -65,6 +66,7 @@ ZFS_AC_DEBUG_KMEM_TRACKING
 ZFS_AC_DEBUG_INVARIANTS
 
 AC_CONFIG_FILES([
+	contrib/debian/rules
 	Makefile
 	include/Makefile
 	lib/libzfs/libzfs.pc