move ks client reader to separated directory

[miledxz]

Proposed changes

Problem: Adding update of ks client Reader interface and FakeReader into separated directory.

Solution: Moved files, updated import paths.

Closes #1573

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[github-actions]

🎉 Thank you for your contribution! It appears you have not yet signed the F5 Contributor License Agreement (CLA), which is required for your changes to be incorporated into an F5 Open Source Software (OSS) project. Please kindly read the F5 CLA and reply on a new comment with the following text to agree:

---

I have hereby read the F5 CLA and agree to its terms

---

Mile seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

[miledxz]

I have hereby read the F5 CLA and agree to its terms