Add Password for Garnet

[Alirexaa]

Description

The implementation is based on https://microsoft.github.io/garnet/docs/security#password-protected-sessions.
Also, I override the entrypoint from /app/GarnetServer to /bin/sh to provide the password from environment variables.

Contributes to #6155

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • x ] Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Is this introducing a breaking change?
      • Yes
        • Link to aspire-docs issue (please use this breaking-change template):
      • No
        • Link to aspire-docs issue (please use this doc-idea template):
  • No

[davidfowl]

Lets make sure we get the redis implementation working and merge end to end (including deployment to azure with azd) before we review this one. Unlike redis, we can influence garnet to add an env variable instead of using arguments 😄 for passwords.

cc @ReubenBond