builtin/refs: add list subcommand
Git's reference management is distributed across multiple commands. As part of an ongoing effort to consolidate and modernize reference handling, introduce a `list` subcommand under the `git refs` umbrella as a replacement for `git for-each-ref`. Implement `cmd_refs_list` by having it call the `for_each_ref_core()` helper function. This helper was factored out of the original `cmd_for_each_ref` in a preceding commit, allowing both commands to share the same core logic as independent peers. Add documentation for the new command. The man page leverages the shared options file, created in a previous commit, by using the AsciiDoc `include::` macro to ensure consistency with git-for-each-ref(1). Mentored-by: Patrick Steinhardt <ps@pks.im> Mentored-by: shejialuo <shejialuo@gmail.com> Mentored-by: Karthik Nayak <karthik.188@gmail.com> Signed-off-by: Meet Soni <meetsoni3017@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>