Live Activity support added

[ozamanav]

Changes

• added test util TestPushTypeLiveActivityHeader
• new EPushType added (PushTypeLiveActivity)
• In aps payload added following 4 new payload keys (ContentState, DismissalDate, Event, Timestamp)
• Added set functions to set this values inside apns object

Let me know if you guys have any questions 😄

[CommanderNULL]

LGTM 👍

[jan-xyz]

Hey @ozamanav I started playing around with your fork, and noticed that the timestamps are float64, is there a specific reason for it to not use int64? I am using float64(time.Now().Unix()) to get a float which seems a bit strange, given that it gets JSON encoded anyways.

[jan-xyz]

I think the doc string is still wrong here, something like this maybe?

Suggested change

	// SetDismissalDate sets the aps dismissal-date on the payload.
	// This will end live activity on dismissal date timestamp.
	//
	// {"aps":{"dismissal-date": DismissalDate }}`
	func (p *Payload) SetEvent(event ELiveActivityEvent) *Payload {
	p.aps().Event = event
	return p
	}
	// SetEvent sets the aps event type on the payload.
	// This can either be `LiveActivityEventUpdate` or `LiveActivityEventEnd`
	//
	// {"aps":{"event": Event }}`
	func (p *Payload) SetEvent(event ELiveActivityEvent) *Payload {
	p.aps().Event = event
	return p
	}

[froodian]

FYI I've submitted #219 based on this PR