Add argument to create_synthetic_data on whether adults are married.

[ChristianZimpelmann]

What problem do you want to solve?

Add argument to create_synthetic_data on whether adults are married.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.47%. Comparing base (f72f0fb) to head (14a4c39).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #730 +/- ## ========================================== + Coverage 89.41% 89.47% +0.06% ========================================== Files 51 51 Lines 3618 3620 +2 ========================================== + Hits 3235 3239 +4 + Misses 383 381 -2 ```

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