feat: add support for registry mirrors

[DmitriyLewen]

Description

• added registry.mirrors flag (only for config file)
  e.g. :

  registry:
    mirrors:
      index.docker.io:
        - harbor.example.com/docker.io
        - mirror.gcr.io
  

• add logic to check mirrors. If can't get image from mirrors - check host registry.

Related issues

• Close support registry mirrors for image scanning #7966

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[knqyf263]

It looks great 👍 Left small comments.

[knqyf263]

@DmitriyLewen I tried to reduce duplicates in 2981a6f, but please correct me if I'm missing something.

[DmitriyLewen]

I always forget that i can use generics :(
great implementation 👍
LGTM

[knqyf263]

I always forget that i can use generics :(

I'm not a big fan of generics as it complicates things, but we can use it in simple cases.