Prep iOS 3.4.1 release

[echo-branch]

Reference

SDK-2350 iOS SDK 3.4.1

Summary

Collection of bugfixes and logging improvements.

Motivation

Type Of Change

Testing Instructions

cc @BranchMetrics/saas-sdk-devs for visibility.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.13%. Comparing base (2009c84) to head (13cdb6f).
Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1378      +/-   ##
==========================================
- Coverage   51.16%   51.13%   -0.04%     
==========================================
  Files          66       66              
  Lines       10133    10158      +25     
  Branches     3718     3724       +6     
==========================================
+ Hits         5185     5194       +9     
- Misses       4692     4705      +13     
- Partials      256      259       +3     

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