`containsAtLeastValues` for column assertions

Today we can assert that a column has **exactly** some values :

```
assertThat(table).column("name").containsValues("Hewson",
"Evans",
"Clayton",
"Mullen");
```

If the table contains more rows / values, the assertion fails.

But it would be nice to have more flexibility and check if the column contains **at least** the given values.

Start at the existing column assertion entry point, containsValues, and review how exact value matching is tested. Add the corresponding containsAtLeastValues behavior for columns and ensure tests cover columns with additional rows while retaining the existing exact assertion behavior.

Vom Indexierungsmodell aus dem Issue-Text verfasst.