Low Code Feature: HMAC-SHA256 Authenticator

I’m requesting a built-in HMAC-SHA256 request-signing authenticator for the Low-code (YAML) CDK. Many APIs require signing requests (e.g., computing a signature from method, path, query, body, timestamp/nonce, then adding it to headers). Today, the Connector Builder UI does not support complex/custom authentication schemes and recommends using the low-code/YAML or Python CDK for signing flows, but there is no ready-made authenticator component for HMAC signing, requiring custom Python components instead ([Custom authentication methods](https://docs.airbyte.com/platform/connector-development/connector-builder-ui/authentication#custom-authentication-methods)).