feat(coinjoin): use blockchain sync as part of mixing

[HashEngineering]

Issue being fixed or feature implemented

Related PR's and Dependencies

PR for dashj: https://github.com/dashpay/dashj/pull/235

Screenshots / Videos

How Has This Been Tested?

• [ ] QA (Mobile Team)

Checklist:

• [ ] I have performed a self-review of my own code and added comments where necessary
• [ ] I have added or updated relevant unit/integration/functional/e2e tests

[HashEngineering]

Actually, this PR is not ready for review yet