Add JCStress for requester and responder Operators

[OlegDokuka]

At the moment we have a number of concurrency tests in the tests codebase but we need to have a more stable source of truth and tooling designed to uncovering racing issues.

TODO:

• FireAndForget without Leasing
• FireAndForget with Leasing
• RequestResponse without Leasing
• RequestResponse with Leasing
• RequestStream without Leasing
• RequestStream with Leasing
• RequestChannel without Leasing
• RequestChannel with Leasing