[MOB-8226] add attribution info to track purchase

[evantk91]

🔹 Jira Ticket(s) if any

• MOB-8226

✏️ Description

This pull request adds optional attribution info to the track purchase public function in IterableApi.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 61.41%. Comparing base (c8fd88c) to head (6284d55).
Report is 4 commits behind head on master.

❗ Current head 6284d55 differs from pull request most recent head f925e44. Consider uploading reports for the commit f925e44 to get more accurate results

Files	Patch %	Lines
...va/com/iterable/iterableapi/IterableApiClient.java	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #720      +/-   ##
==========================================
- Coverage   61.45%   61.41%   -0.05%     
==========================================
  Files          75       75              
  Lines        4696     4701       +5     
  Branches      533      535       +2     
==========================================
+ Hits         2886     2887       +1     
- Misses       1509     1511       +2     
- Partials      301      303       +2     

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[Ayyanchira]

Looking good. Added a optional recommendation of using putOpt.

[Ayyanchira]

LGTM!