feat: add missing cache commands

[norskeld]

In #7 I implemented some basic cache commands like list and clear, but more granular and user-friendly way of managing cache entries remains to be implemented, i.e.:

• Removing specific cache entries. This should allow:
  • Remove whole entries with all items attached to it by using <host>:<user>/<repo>;
  • Remove entries matching the ref name, e.g. branch name;
  • Remove entries matching the commit hash.
• Removing cache entries interactively. This is kinda unnecessary and a annoying to implement.

Also cache clear command should be replaced with cache remove --all.