Issue-6559 Add ability to create decision labels within a policy

[tsidebottom]

Why the changes in this PR are needed?

Adds a DecisionLabel Field (a Map Object) to the Decision Log output to track Policy Result Data.

What are the changes in this PR?

• A new field (DecisionLabel) was added to the Decision Log
• This field was propagated backwards through the Policy Evaluation process
  • includes updates to files in Topdown, Rego, and SDK domains
• A new builtin (DecisionLabelAdd) was created to populate the new field during evaluation

Notes to assist PR review:

Further comments:

Addresses #6559

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[ashutosh-narkar]

Thanks for the contribution @tsidebottom. FYI we've added some comments on https://github.com/open-policy-agent/opa/issues/6559 about the proposed feature including the latest one here. It would be helpful to identify alternate ways of achieving what's needed for https://github.com/open-policy-agent/opa/issues/6559. Thanks.

[stale[bot]]

This pull request has been automatically marked as stale because it has not had any activity in the last 30 days.

[ashutosh-narkar]

Closing this PR for now. We can continue the discussion in https://github.com/open-policy-agent/opa/issues/6559. There are other approaches discussed in the issue on how to address this. In its current form this PR is unlikely to be merged and there's been no activity on it for a while so feel free to re-open in draft mode if needed with modifications. Thanks for your time and work on this!