Scan Sparrow QR PSBTs

## Issue:
* It is extraordinarily difficult to add Jade to an existing quorum of multisig devices.

## Description:
When adding a Jade to a multisig quorum managed by Sparrow, it is impossible to transmit a PSBT for signing using QR codes.

Sparrow has a protocol for doing multiple-QR codes to transmit the PSBT.

Every time the Jade scans the PSBT QR code sequence, it scans some of the QR codes then fails with an error saying "invalid psbt".

## Current Behavior
* The Jade attempts to read the sequential QR codes one time, failing if one or more QR scans fail

## Desired Behavior
* The Jade should continually scan the QR codes as the sequence repeats and attempt to stitch together the pieces it scans into a valid PSBT -- trying at least 3 cycles but ideally a dozen or even continually.