Allow updating of user passwords

[jamesreprise]

What is the goal of this PR?

We've added the ability to update user passwords through TypeDB Console.

This can be done with the syntax: user password <username> The user is then prompted to input a new password.

What are the changes implemented in this PR?

We've added a REPLCommand subclass Password that contains the necessary information to update a user's password.

[typedb-bot]

PR Review Checklist

Do not edit the content of this comment. The PR reviewer should simply update this comment by ticking each review item below, as they get completed.

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Trivial Change

• [x] This change is trivial and does not require a code or architecture review.

Code

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• [ ] Packages, classes, and methods are grouped into cohesive and consistent domain model.
• [ ] The code is canonical and the minimum required to achieve the goal.
• [ ] Modules, libraries, and APIs are easy to use, robust (foolproof and not errorprone), and tested.
• [ ] Logic and naming has clear narrative that communicates the accurate intent and responsibility of each module (e.g. method, class, etc.).
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Architecture

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• [ ] The architecture is extensible and scalable.