feat: Add order grouping support

[JoanLaRosa]

Add support for order grouping to improve take-profit/stop-loss order visualization on the Hyperliquid website. When orders are grouped, their TP/SL orders will be visually linked together in the UI, making it easier to track related orders.

• Add optional grouping parameter to Exchange.order() with default value "na"
• Pass grouping parameter through to bulk_orders()
• Update order_wires_to_order_action() to include grouping parameter
• Maintain backwards compatibility by defaulting to "na" grouping

[traderben]

The grouping API is pretty confusing so I think if we were to add this it's worth updating basic_tpsl to demonstrate how to use the different groupings

[traderben]

By the way I didn't approve the PR because it's failing lint. I didn't think to post a comment but I realized you might not have received a notification when I approved running the actions