Add initial TOTP watch face impl
Vendor code from https://github.com/Netthaw/TOTP-MCU to do the heavy lifting of computing SHA-1 and HMAC and the rest of TOTP Also implement a date_time to unix timestamp method
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Vendor code from https://github.com/Netthaw/TOTP-MCU to do the heavy lifting of computing SHA-1 and HMAC and the rest of TOTP Also implement a date_time to unix timestamp method