Password Hashing update

[TheAndrewJackson]

Purpose

Update frontend to send base64 hashed password to backend

Changes

• base64 encode password on frontend
• update backend to decode incoming base64 back into plaintext & fix all backend test failures
• add more tests for cryptographic_utils

Checklist

• Update CHANGELOG.md file
  • Merge in main so the most recent CHANGELOG.md file is being appended to
  • Add description within the Unreleased section in an appropriate category. Add a new category from the list at the top of the file if the needed one isn't already there.
  • Add a link to this PR at the end of the description with the PR number as the text. example: #1
• Applicable documentation updated (guides, quickstart, postman collections, tutorial, fidesdemo, database diagram.
• If docs updated (select one):
  • documentation complete, or draft/outline provided (tag docs-team to complete/review on this branch)
  • documentation issue created (tag docs-team to complete issue separately)
• Good unit test/integration test coverage
• This PR contains a DB migration. If checked, the reviewer should confirm with the author that the down_revision correctly references the previous migration before merging
• The Run Unsafe PR Checks label has been applied, and checks have passed, if this PR touches any external services

Ticket

Fixes #

[pattisdr]

Nice improvement @TheAndrewJackson. The "Managing Users from the API" docs could also be updated here https://ethyca.github.io/fidesops/ui/user_management/#managing-users-from-the-api

[TheAndrewJackson]

Thanks for taking a look @pattisdr and good find. I'll work on updating those docs now

[pattisdr]

looks good to me @TheAndrewJackson given the objectives we decided on for this one.