wboayue / rust-ibapi / 20614551086

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feat: Add sync client method to subscribe to display group events (#358)

* feat: Add sync client method to subscribe to display group events

- Add DisplayGroupUpdate type with StreamDecoder implementation
- Add subscribe_to_group_events to sync Client
- Add sync example for group events

* refactor: align display group implementations with established patterns

- Move async implementation to display_groups/async.rs module
- Unify return type to Subscription<DisplayGroupUpdate> for both sync/async
- Use StreamDecoder pattern instead of inline decoder/cancel functions
- Remove unused set_cancel_fn and has_cancel_fn methods
- Update async example to use DisplayGroupUpdate type

* refactor: decoder returns DisplayGroupUpdate directly

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