Feat(Data Mapper): Refactoring deserialization for v2

[DanielleCogs]

• Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines
• [x] Tests for the changes have been added (for bug fixes/features)
• [ ] Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) refactor

• What is the current behavior? (You can also link to an open issue here)

• What is the new behavior (if this is a feature change)? deserialization is easier to understand, and should have less bugs! Not completely done yet, so tests that are not passing are disabled

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• Please Include Screenshots or Videos of the intended change:

[github-actions[bot]]

Code Coverage Report

Package	Base Coverage	New Coverage	Difference
mapHandling	🔴 9.09%	🟢 83.54%	🟢 74.45%
utils	🔴 45.86%	🟠 51.37%	🟢 5.51%
Overall Coverage	🟢 20.98%	🟢 26.05%	🟢 5.07%

Minimum allowed coverage is 0%, this run produced 26.05%