Reduce allocations, chapter III #11347

Job	Run time
Rego PR checks	1m 46s
Go Lint	2m 1s
YAML Lint	19s
Generate Code	1m 8s
Go Race Detector	6m 44s
Check Generated	23s
Go Test (linux)	4m 45s
Go Build (linux amd64)	2m 30s
Go Test (darwin)	4m 51s
Go Build (linux arm64)	2m 20s
WASM	9s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 9s
Go compat build/test (ubuntu-22.04, 1.21)	4m 2s
Go Build (windows amd64)	2m 33s
Go Build (darwin amd64)	2m 0s
Go compat build/test (macos-14, 1.21)	4m 22s
Go Build (darwin arm64)	41s
docker image smoke test	41s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64, amd64)	12s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64_static, amd64, disabled)	9s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	26s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	14s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	43s
	45m 8s

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