enhancement: support row on click in nested-grid like in simple-v-table

[hipitihop]

simple-v-table has an on-click handler which dumps the row object to the devtools console. This is super useful when debugging these tables and one can see other row properties which may not be directly displayed.

Can this be implemented in the new nested-grid too please ?

https://github.com/day8/re-com/blob/7957ff0d5424d6d7f2804bd61b5c79460b6ddedb/src/re_com/simple_v_table.cljs#L178-L179