While map.toDataRow() is very helpful, there's no easy way to fully unfold nested maps to to datarows, like

val map = mapOf(
    "name" to "a",
    "metadata" to
        mapOf(
            "country" to "Philippines",
            "region" to mapOf("name" to "Caraga", "code" to "XIII"),
            "population" to mapOf("value" to "12345", "year" to 2020),
            "wrongMap" to mapOf(1 to 2, 4 to 4),
        ),
)

Similarly to unfold and toDataFrame(), we could add a maxDepth parameter that would allow us to specify the maximum depth of nesting we scan for and convert.
convertKeysToString: Boolean might be another nice addition because there's no way to tell if keys are strings or not until we encounter a ClassCastException.

Iterable<Map<String, Any?>>.toDataFrame() should probably gain the same treatment.

And if we're converting keys to strings anyways, let's make it work for Map<Any, Any?>, why not