Added Print for Policy Outcome

[straubt1]

Description

The policy-set-outcomes API response includes an output array on each outcome object containing print entries emitted by Sentinel policies. The Outcome struct does not expose this field.

There are additional fields that can be added, but "print" is the output of the the policy logs.

Changes

• Added OutcomeOutput struct with a Print string field (jsonapi:"attr,print")
• Added Output []OutcomeOutput field to Outcome struct (jsonapi:"attr,output,omitempty")
• Added unit tests in policy_evaluation_test.go covering field present and field absent cases
• Updated policy_evaluation_beta_test.go with an assertion and comment for the Output field
• Added CHANGELOG entry under Enhancements

Testing

• go build ./... passes
• go vet ./... passes (pre-existing warning in examples/backing_data/main.go unrelated to this change)
• Unit tests TestPolicySetOutcomes_OutcomeOutputDeserialization and TestPolicySetOutcomes_OutcomeOutputEmpty pass