Request user password when performing sensitive actions

[Supereg]

Problem

Firebase requires a recent login when preforming sensitive actions like changing the primary email address or password (e.g., refer to FIRUser#-updatepassword:completion:. As SpeziAccount currently doesn't allow to easily customize UI to request reauthentication from the user, we currently securely store the users password to do reauthentication on the fly.

Solution

Investigate the necessary changes to SpeziAccount to easily request reauthentication through the user. This could be by requiring entry of the current password or by sending a E-Mail authentication link.
This would need to consider future cases for password-less scenarios (like Sign in with Apple or Passkeys).

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct and Contributing Guidelines

[Supereg]

This was first introduced with #18