support new API in iOS 13

[HePingLaoSan]

Description

Apple has some new API in iOS 13， such as CBConnectionEvent

- (void)registerForConnectionEventsWithOptions:(nullable NSDictionary<CBConnectionEventMatchingOption, id> *)options

- (void)centralManager:(CBCentralManager *)central connectionEventDidOccur:(CBConnectionEvent)event forPeripheral:(CBPeripheral *)peripheral

Does have plan to support this？Thx！

What type of issue is this? (place an x in one of the [ ])

• [ ] bug
• [x] enhancement (feature request)
• [ ] question
• [ ] documentation related
• [ ] testing related
• [ ] discussion

Requirements (place an x in each of the [ ])

• [x] I've read and understood the Contributing guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.
• [x] I've searched for any related issues and avoided creating a duplicate issue.

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