[Feature] Allow merge user profiles on update email call.

[PedroTrabulo-Hostelworld]

Add support to allow merge user profile when updating the user email. Add and update test coverage.

🔹 Jira Ticket(s) if any

None: add support for an endpoint parameter based on ongoing Iterable implementation

✏️ Description

Add support to allow merge user profile when updating the user email.
Add and update test coverage.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (1ed0c34) 62.08% compared to head (97a9a45) 62.18%.

❗ Current head 97a9a45 differs from pull request most recent head 4913c9e. Consider uploading reports for the commit 4913c9e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #641      +/-   ##
==========================================
+ Coverage   62.08%   62.18%   +0.09%     
==========================================
  Files          69       69              
  Lines        4033     4041       +8     
  Branches      469      470       +1     
==========================================
+ Hits         2504     2513       +9     
+ Misses       1281     1279       -2     
- Partials      248      249       +1     

Files	Coverage Δ
...va/com/iterable/iterableapi/IterableApiClient.java	75.15% <100.00%> (+0.15%)	⬆️
...va/com/iterable/iterableapi/IterableConstants.java	0.00% <ø> (ø)
...ain/java/com/iterable/iterableapi/IterableApi.java	57.92% <40.00%> (-0.56%)	⬇️

... and 1 file with indirect coverage changes

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