[MOB-3091] - Sync In App after initialization

[Ayyanchira]

🔹 Jira Ticket(s) if any

https://iterable.atlassian.net/browse/MOB-3091

This is fix suggested in review: Iterable/react-native-sdk#174. This way RN Android wont need any change.

✏️ Description

syncInApp() is called right after InAppManager is initialized. SyncInApp call when switching to foreground remains unaffected. Duplicate calls will also be not made as lastSyncTime is updated inside SyncInApp call.

[codecov]

Codecov Report

Merging #371 (bf48b2e) into master (987ec0d) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #371      +/-   ##
==========================================
+ Coverage   67.38%   67.60%   +0.22%     
==========================================
  Files          61       61              
  Lines        3780     3781       +1     
  Branches      440      440              
==========================================
+ Hits         2547     2556       +9     
+ Misses        969      965       -4     
+ Partials      264      260       -4     

Impacted Files	Coverage Δ
...com/iterable/iterableapi/IterableInAppManager.java	88.03% <100.00%> (+0.53%)	⬆️
...va/com/iterable/iterableapi/IterableApiClient.java	76.20% <0.00%> (+0.60%)	⬆️
...ain/java/com/iterable/iterableapi/IterableApi.java	65.02% <0.00%> (+0.77%)	⬆️
.../iterable/iterableapi/IterableActivityMonitor.java	95.08% <0.00%> (+3.27%)	⬆️

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