feat: add on_register_failed hook

[kenkalang]

Proposed Changes

This change contains creating on_register_failed hook event on sidecar plugin. This hook will capture client property and reason of failed register.
These are list of reasons on failed registration:

enum RegistrationFailureReason {
    REASON_UNSPECIFIED = 0;
    REASON_NO_MATCHING_HOOK_FOUND = 1;
    REASON_INVALID_CREDENTIALS = 2;
    REASON_NOT_AUTHORIZED = 3;
    REASON_STALE_REQUEST = 4;
    REASON_INVALID_SIGNATURE = 5;
    REASON_USERNAME_RID_MISMATCH = 6;
}

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[dhruvjain99]

Please fix the failing ci