Keycode lookup if esp32_mouse_keyboard aka ESP32miniBT module is connected.

[benjaminaigner]

Currently, it is not possible to use different keyboard layouts than US for the FLipMouse.
As we have limited resources in the FLipMouse (current master: 92% Flash, 79% static RAM usage),
we could implement a lookup of keys / text or keycodes via the ESP32 module (4MB flash -> we can store all supported keymaps of Teensyduino there).

In my opinion, we need following new features:

• Detect if a compatible ESP32 module is connected
• A dynamic table which contains the most recently used keycodes
• Update mechanism to load a new keycode for a key from ESP32
• Fallback solution (e.g. currently used static keymap) if dynamic update is not possible

[benjaminaigner]

Won't be implemented in v2 due to the problem that we cannot rely on a connected ESP32;
in v3 we could implement different keyboard layouts on the RP2040 already.