[Feature] Unknown User Activation

[evantk91]

🔹 Jira Ticket(s) if any

• MOB-XXXX

✏️ Description

This pull request merges anonymous user tracking (AUT) code into main branch.

[codecov]

Codecov Report

Attention: Patch coverage is 50.79197% with 466 lines in your changes missing coverage. Please review.

Project coverage is 59.43%. Comparing base (20a9821) to head (8a52ce0).
Report is 66 commits behind head on master.

Files	Patch %	Lines
...com/iterable/iterableapi/AnonymousUserManager.java	50.90%	99 Missing and 10 partials ⚠️
...le/iterableapi/util/CriteriaCompletionChecker.java	69.47%	74 Missing and 31 partials ⚠️
.../iterable/androidsdk/AnonTrackingTestActivity.java	0.00%	91 Missing ⚠️
...va/com/iterable/iterableapi/IterableApiClient.java	43.82%	43 Missing and 7 partials ⚠️
...ain/java/com/iterable/iterableapi/IterableApi.java	59.63%	30 Missing and 14 partials ⚠️
...ain/java/com/iterable/androidsdk/MainActivity.java	0.00%	31 Missing ⚠️
...in/java/com/iterable/iterableapi/ddl/Criteria.java	0.00%	21 Missing ⚠️
.../java/com/iterable/iterableapi/IterableKeychain.kt	42.85%	6 Missing and 2 partials ⚠️
...a/com/iterable/iterableapi/AnonymousUserMerge.java	62.50%	3 Missing and 3 partials ⚠️
...com/iterable/iterableapi/util/MatchComparator.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #730      +/-   ##
==========================================
- Coverage   61.40%   59.43%   -1.97%     
==========================================
  Files          75       84       +9     
  Lines        4705     5710    +1005     
  Branches      535      717     +182     
==========================================
+ Hits         2889     3394     +505     
- Misses       1515     1939     +424     
- Partials      301      377      +76     

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