[Feature request] Add support to wl_keyboard for wayland to send xkb RMLVO tuple.
The use case this is intended for input method.
In input method, one use case that we want to use the layout/variant specified by user, re-use xkb options from the system. Right now we only have keymap fd which only contains some raw data. It would ideal to have the same thing like _XKB_RULES_NAMES under X11.
zwp_input_method_v1 is reusing wl_keyboard interface; zwp_input_method_v2 in the wild is following the interface of wl_keyboard. So I'd like to have the support in wl_keyboard first.