adding sycn event

[adicatur]

User can listen sync event

@Subscribe public void onQiscusSycnEvent(QiscusSyncEvent syncEvent) { switch (syncEvent) { case STARTED: //sync started break; case FAILED: //sync failed break; case ENDED: ////sync ended break; } }

[codecov[bot]]

Codecov Report

Merging #28 into develop will not change coverage. The diff coverage is 0%.

@@          Coverage Diff           @@
##           develop    #28   +/-   ##
======================================
  Coverage        0%     0%           
======================================
  Files          119    120    +1     
  Lines         9484   9490    +6     
  Branches       979    978    -1     
======================================
- Misses        9484   9490    +6

Impacted Files	Coverage Δ
...ain/java/com/qiscus/sdk/event/QiscusSyncEvent.java	0% <0%> (ø)
...qiscus/sdk/ui/fragment/QiscusBaseChatFragment.java	0% <0%> (ø)	:arrow_up:
...va/com/qiscus/sdk/service/QiscusPusherService.java	0% <0%> (ø)	:arrow_up:

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