basic: rename cap-list.c -> capability-list.c

This also renames relevant files in the same way.

Addresses https://github.com/systemd/systemd/pull/37904#discussion_r2191950396

src/basic/capability-to-name.awk

@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+BEGIN{
+        print "static const char* const capability_names[] = { "
+}
+{
+        printf "        [%s] = \"%s\",\n", $1, tolower($1)
+}
+END{
+        print "};"
+}