feat: add full support for TPSL orders and PermitSingle

[Dmkls]

Description

This PR introduces native support for direct Take Profit / Stop Loss (TPSL) order placement and budget approvals, which were previously missing from the SDK. Since TPSL orders are handled off-chain and are not supported by the standard RISEx limits endpoint, this adds the necessary EIP-712 structs, type definitions, and client methods to execute them seamlessly.

Changes Included:

• Types: Added TypeScript interfaces for ApprovePermitSingleParams, PlaceTpslOrderParams, CancelTpslOrderParams, and TpslOrder in src/types/order.ts.
• EIP-712 Domains: Exported EIP-712 typing structs (PERMIT_SINGLE_TYPES, PLACE_TPSL_TYPES, CANCEL_TPSL_TYPES) in src/signing/domain.ts.
• InfoClient: Added getOpenTpslOrders to fetch currently open TPSL orders.
• ExchangeClient: Added the core authenticated methods:
  • approvePermitSingle: Approves the operator_hub budget.
  • placeTpslOrder: Signs and places a TPSL order.
  • cancelTpslOrder: Signs and cancels a TPSL order.
• Helper: Exported hexToBase64 in permit.ts to properly format signatures for the Rise backend.

Testing

• Successfully compiled using npm run build with zero type errors.
• Signatures align with actual operator_hub and RISEx API requirements.