feat(boards): Add BlueMicro833 V1 board definition

[petejohanson]

Board/Shield Check-list

• This board/shield is tested working on real hardware
• Definitions follow the general style of other shields/boards upstream (Reference)
• .zmk.yml metadata file added
• Proper Copyright + License headers added to applicable files
• General consistent formatting of DeviceTree files
• Keymaps do not use deprecated key defines (Check using the upgrader tool)
• &pro_micro used in favor of &pro_micro_d/a if applicable
• If split, no name added for the right/peripheral half
• .conf file has optional extra features commented out

[petejohanson]

Don't have hardware, posting this for @jpconstantineau to be able to test when he's ready.

[jpconstantineau]

Code looks good. I don't have the hardware on hand and built yet (waiting on JLC to ship...). I'll need help for setting up a simple board config & UF2 to be able to test the hardware. Perhaps something as simple as a 18 keys directly attached to GPIO board... I have one here I can't recall the name of it...