Add method to get all payload data

[steelbrain]

Adds a new method that returns all of payload as a JSONObject. It handles JSON errors the same way other methods do in this file.

Context: #50 (comment)

[vbabenkoru]

Thanks! Isn't it enough to just return a Bundle?

[steelbrain]

Bundle works, I did JSON because it's specific to my usecase but I think the conversion could live in consumerland

Updated!

[codecov]

Codecov Report

Merging #51 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
- Coverage   54.66%   54.62%   -0.05%     
==========================================
  Files          24       24              
  Lines        1361     1362       +1     
  Branches      142      142              
==========================================
  Hits          744      744              
- Misses        526      527       +1     
  Partials       91       91

Impacted Files	Coverage Δ
...ain/java/com/iterable/iterableapi/IterableApi.java	48.78% <0%> (-0.12%)	⬇️

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[vbabenkoru]

By the way, do you only need this within one app session? In the iOS version of the SDK, we store the push payload for 24 hours.

[steelbrain]

Yes the payloads are instantly sent to React Native world where they are dealt with