feat(secretmanager): [SecretManager] add support for Managed Rotation (googleapis#9339)

* feat(secretmanager): add support for Managed Rotation

This change introduces new RPCs and types to support the Managed Rotation feature for secrets:

- New RPCs:
    - `EnableManagedRotation`: Enables managed rotation on a secret.
    - `RotateSecret`: Triggers an immediate rotation for a secret with managed rotation enabled.

- New Types:
    - `SecretType` enum: Allows specifying the type of secret, including `CLOUD_SQL_DB_CREDENTIALS`.

- New Fields:
    - Added `policy_member` to the `Secret` resource, which defines the policy member for the secret.
    - Added `managed_rotation_status` to the `Rotation` message, to surface the current state and any errors for managed rotation.

PiperOrigin-RevId: 946895132

Source-Link: googleapis/googleapis@fc645e5

Source-Link: https://github.com/googleapis/googleapis-gen/commit/424a88edcfd6475667684f645f6b5979e2bc4622
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* 🦉 Updates from OwlBot post-processor

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* chore(Gax): update common protos minimum version

* chore(SecretManager): update GAX to next version

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Brent Shaffer <betterbrent@google.com>

Author: gcf-owl-bot[bot]