[Keyboard] CannonKeys Instant60 Keyboard (#5433)

* Instant 60

* Instant60 changes again

* turn off LSE and features

* Working RGB underglow 🎉

* Add missing files

* Update keymap to have reset

* Backlighting on

* Backlight code for instant60

* Move 072 files to common folder and use it in Instant60

* Updates

* Update keyboards/cannonkeys/instant60/rules.mk

Co-Authored-By: awkannan <andrew.kannan@klaviyo.com>

keyboards/cannonkeys/stm32f072/keyboard.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "quantum.h"
+
+typedef union {
+    uint8_t raw;
+    struct {
+        bool    enable :1;
+        bool    breathing : 1;
+        uint8_t level  :6;
+    };
+} backlight_config_t;
+
+// Backlighting
+extern backlight_config_t kb_backlight_config;
+extern bool kb_backlight_breathing;
+void backlight_init_ports(void);
+void backlight_set(uint8_t level);
+bool is_breathing(void);
+void breathing_enable(void);
+void breathing_disable(void);
+void load_custom_config(void);
+void save_backlight_config_to_eeprom(void);