[MYR-881] Autogenerate password and return gun public and ePublic keys in friends list

[rei-gun]

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Description

• src/tests/integration/controllers/user.controller.integration.ts
  • added test for POST /users
• src/controllers/user.controller.ts
  • added password generation via hash.
  • I think the salt needs to be manually set and saved in our .env file because it's using default salt atm
  • the hashing should be done in UserRepository's create() function instead of the controller

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• Builds and runs on Windows
• Builds and runs on MacOS
• Builds and runs on Linux
• Builds and runs on Docker (Linux)
• Unit tests?
• Integration tests?
• End-to-end (E2E) tests?

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• Have you added yourself as the Assignee?
• Have you added 1 or more leads as the Reviewer?
• Have you chosen 1-2 of the following labels?
  • Feature
  • Bug
  • Refactor
  • Test
  • Documentation