feat: audit trail in stdout logs

[fredmaggiowski]

This PR introduced an experimental audit feature within sdk and core packages.

The service can be configured to use it via environment variables.

The audit process will produce a stdout log with a standardized field-set about the request.

The field-set can be extended via policy evaluation by using a new builtin function

➜  rond git:(feat/audit-trail-in-stdout-logs) ✗ go test ./ -run=TestIntegrationWithAuditTrail -v | grep trail
{"level":30,"msg":"audit trail","time":1733235498148,"trail":{"aggregationId":"","authorization":{"allowed":true,"policyName":"allow_policy_with_audit_data"},"labels":{"a":42},"requestBody":null,"subject":{"groups":[],"id":""}}}
{"level":30,"msg":"audit trail","time":1733235498148,"trail":{"aggregationId":"","authorization":{"allowed":true,"policyName":"projection_policy_with_audit_data"},"labels":{"b":42},"requestBody":null,"subject":{"groups":[],"id":""}}}

[coveralls]

Pull Request Test Coverage Report for Build 12185069693

Details

• 255 of 273 (93.41%) changed or added relevant lines in 17 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.7%) to 85.911%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/utils/to_map.go	39	40	97.5%
core/opaevaluator.go	16	18	88.89%
sdk/sdk.go	6	10	60.0%
internal/audit/rego_builtin.go	0	11	0.0%

Totals
Change from base Build 12157575883:	0.7%
Covered Lines:	2622
Relevant Lines:	3052

---

💛 - Coveralls

[danielemarostica]

✨

[davidebianchi]

LGTM