feat(valkey): add Valkey module

[daric93]

I’d like to add Valkey, the open-source fork of Redis, as a dedicated Testcontainers module.

• Docker container: valkey/valkey:latest
• Valkey website: https://valkey.io/
• Documentation: https://valkey.io/docs/

[daric93]

Hi @alexanderankin, I opened this PR to add Valkey test container as mentioned in this ticket. Would appreciate a review when you have a moment. Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.24%. Comparing base (baa5668) to head (4c8007b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #947   +/-   ##
=======================================
  Coverage   79.24%   79.24%           
=======================================
  Files          15       15           
  Lines        1277     1277           
  Branches      154      154           
=======================================
  Hits         1012     1012           
  Misses        219      219           
  Partials       46       46           

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