Json to nu struct with lazy map implementation

[vder]

Describe your changes

some (local) numbers:

[info] Benchmark                                             Mode  Cnt   Score   Error   Units
[info] NuStructBenchmark.deserialize                        thrpt    8   6.390 ± 0.067  ops/ms
[info] NuStructBenchmark.deserializeWithLazyMap             thrpt    8  27.033 ± 3.003  ops/ms
[info] NuStructBenchmark.deserializeWithoutNuStruct         thrpt    8  27.890 ± 0.394  ops/ms

Checklist before merge

• [ ] Related issue ID is placed at the beginning of PR title in [brackets] (can be GH issue or Nu Jira issue)
• [ ] Code is cleaned from temporary changes and commented out lines
• [ ] Parts of the code that are not easy to understand are documented in the code
• [ ] Changes are covered by automated tests
• [ ] Showcase in dev-application.conf added to demonstrate the feature
• [ ] Documentation added or updated
• [ ] Added entry in Changelog.md describing the change from the perspective of a public distribution user
• [ ] Added MigrationGuide.md entry in the appropriate subcategory if introducing a breaking change
• [ ] Verify that PR will be squashed during merge