SDK: Export functions for supporting configurable consensus.

[gmalouf]

Summary

To support the configurable consensus request in go-algorand-sdk Issue #754, this PR updates the export_sdk_types script to include a few functions for deep copying, merging, and updating consensus params.

Test Plan

Script has been run locally, changes are applied to go-algorand-sdk in go-algorand-sdk #756

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.40%. Comparing base (19a679f) to head (f554bdf).
⚠️ Report is 2 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6490      +/-   ##
==========================================
- Coverage   47.53%   47.40%   -0.14%     
==========================================
  Files         667      659       -8     
  Lines       88572    88393     -179     
==========================================
- Hits        42102    41899     -203     
- Misses      43705    43713       +8     
- Partials     2765     2781      +16     

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