Implementation of DAG workloads in client

[kirillsc]

Description

WIP

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes
• (Core team) Added labels for change area (e.g. area/controlplane) and kind (e.g. kind/improvement)

BONUS POINTS checklist:

• Backfilled missing tests for code in same general area
• Refactored something and made the world a better place

[linux-foundation-easycla]

• ✅ login: kirillsc / name: Kirill Bogdanov (897a24a, d044a44)
• ❌ The email address for the commit (f96de89) is not linked to the GitHub account, preventing the EasyCLA check. Consult this Help Article and GitHub Help to resolve. (To view the commit's email address, add .patch at the end of this PR page's URL.) For further assistance with EasyCLA, please submit a support request ticket.