Allow opting out of content-based FIFO deduplication for raw sends

[mensfeld]

Queue#add_fifo_attributes! always set message_deduplication_id to a SHA256 of the body when none was provided, so two raw sends of an identical body within SQS's 5-minute window (Worker.perform_async, Queue#send_message/#send_messages) were silently deduplicated - the second dropped. ActiveJob got an opt-out in #1017
(active_job_fifo_message_deduplication) but the raw path had none.

Add the symmetric Shoryuken.fifo_message_deduplication flag (default true, so behaviour is unchanged). When set false, Shoryuken no longer auto-generates the dedup id; callers provide message_deduplication_id themselves or enable ContentBasedDeduplication on the queue.

[coderabbitai]

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