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feat: Add update_display_group method to clients (#389)

* feat: Add update_display_group method to clients

Implement new method to update contracts in TWS display groups for
both synchronous and asynchronous clients. The method allows changing
the displayed contract by providing a contract identifier.

* Add integration tests for update_display_group (async + sync)

* Move update_display_group into DisplayGroupSubscription wrapper

Replace client.update_display_group() with subscription.update().
DisplayGroupSubscription wraps Subscription<DisplayGroupUpdate> via
Deref/DerefMut, adding only the update() method.

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Co-authored-by: Wil Boayue <wil.boayue@gmail.com>

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