[Keymap] Add pezhore preonic keymap (#10269)

* Squashing commits - adding preonic keymap

This adds a custom keymap, including numpad layer, emoji, and kamoji
key mappings.

* Removing unnecessary trailing backslash characters

* removing the unnecessary json keymap

* removing unnecessary trailing slashes from the default keymap

* switching to tap_code

* Apply suggestions from code review

This should enable a toggleable numpad

* adding license

* Stripping out FN keycodes in favor of a momentary layer

keyboards/preonic/keymaps/pezhore/rules.mk

@@ -0,0 +1,3 @@
+SRC += muse.c
+#UNICODEMAP_ENABLE = yes
+UNICODE_ENABLE = yes