scripts for key and credential migration

[briskt]

IDP-2161 Plan moving Wycliffe's 2SV data

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Added

• Added data migration scripts to copy API keys and TOTP/WebAuthn credentials from one set of tables to another.

[briskt]

I used a combination of Gemini, Copilot, and Claude to generate this code. I may have even contributed a few lines myself. I tested it by moving data from the dev (staging) tables into tables running locally on my machine. For final testing, I used the SIL credentials from the production tables and uploaded to the same local DynamoDB container I used for dev credentials. There were no performance or memory issues, but it did seem to slow down slightly as it neared completion of the upload of the production data set.

[hobbitronics]

I have a hard time reading bash of this complexity and am not familiar with much of what's going on here, but the scripts share the same shape which helps and tests seem valid. I asked about the commands and Copliot had some concerns which may or may not be valid.