Acceptance criteria

• Implement the v1/is_certificate_trusted capability in the SDK, following the WaPC protocol described in the cryptographic capabilities spec.
• Add unit tests to validate the correct construction of the request payload, parsing of the host response, and edge cases
• Add integration tests against a mock Wasm host
• Add end-to-end tests via the test policy (using kwctl and bats) to verify that the capability behaves correctly when given trusted and untrusted certificates.