Version 2.0.0 - Secret Key encryption logic

[jlcvp]

Description

The app should be able to optionally encrypt/decrypt the secrets of the accounts with a user password without.
Users must be warned the accounts will be lost if they lose the password.

Subtasks

• Encrypt/decrypt logic
• Import/Export handling
• Ask for password on account loading
• When activating encryption with locked accounts and choosing a password that doesn't decrypt the accounts, ask for the correct password.
• Do not let activate encryption with locked accounts
• Optionally save password on local storage (will addressed in Optionally save decryption password in localstorage #17 )
• Informational alerts when setting up the password
• Migration from password-less version
• Detect unencrypted base and ask the users if they want to encrypt the data

addresses #7

[github-actions]

Visit the preview URL for this PR (updated for commit 0187a32):

https://authleu--pr14-account-secret-encry-3y262wec.web.app

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