Add HTTPAltTaskValidator with .afterTask Retry Strategy

[Marcodeg]

Summary:

This PR introduces HTTPAltTaskValidator, a powerful HTTP validator designed to execute an alternate task (e.g., silent re-authentication) using the .afterTask retry strategy before reattempting the original request.

Key Features:

• .afterTask Strategy: Utilizes .afterTask to ensure the alternate task completes before retrying the request.
• Configurable Triggers: Activated on specified HTTP status codes (default: 401, 403).
• Error Handling: Allows a custom error catcher for alternate task failures.
• Retry Control: Supports retry delays and limits on alternate task attempts.