DRAFT: daml for confirmation response traffic reimbursement

[meiersi-da]

Built to double-check the design doc, and serve as a foundation for the implementation.

Pull Request Checklist

Cluster Testing

• If a cluster test is required, comment /cluster_test on this PR to request it, and ping someone with access to the DA-internal system to approve it.
• If a hard-migration test is required (from the latest release), comment /hdm_test on this PR to request it, and ping someone with access to the DA-internal system to approve it.

PR Guidelines

• Include any change that might be observable by our partners or affect their deployment in the release notes.
• Specify fixed issues with Fixes #n, and mention issues worked on using #n
• Include a screenshot for frontend-related PRs - see README or use your favorite screenshot tool

Merge Guidelines

• Make the git commit message look sensible when squash-merging on GitHub (most likely: just copy your PR description).

[meiersi-da]

No longer required. A more recent version of the ActionRequiringConfirmation and CryptoHash idea is available from:

• DO NOT MERGE: Daml code for implementing traffic-based app rewards #3964