Svilen Ivanov

Add json format functions for key-value lists

1

Support formatting key-value lists while preserve their ordering. Closes #8882

json module format functions for key-value lists

1

Existing `json:encode_key_value_list/2` and `json:encode_key_value_list_checked/2` can be used to encode key-value lists while preserve their ordering. It will be great if `json` module exports corresponding `-spec format_key_value_list([{term(), term()}], Encode::formatter(), State::map()) ->...