feat: list orders function and a validations utils

[AndreaDiazCorreia]

Validation Centralization:

Introduced a new utils/validation.ts module containing reusable functions for validating public keys, private keys, and orders.
Replaced inline validations across the codebase with centralized methods to enhance reusability and consistency.
Core Enhancements in core/order.ts:

Added parseOrder, a function to transform Nostr events into Order objects.
Updated createOrder to leverage centralized validations and improved error handling for invalid inputs.
Client Extensions in client/order.ts:

Implemented listOrders, a function to fetch and deserialize orders from a Nostr relay using optional filters.
Refactored newOrder to validate inputs with centralized utilities, improving code robustness and clarity.
Improved Error Handling:

Added detailed error messages for cases like invalid keys, malformed orders, or relay fetch errors.

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