feat(subscriber): Add with_span_list implementation for all standard formats.

[humb1t]

Motivation

As a "out-of-the-box" subscribers user, I want to be able to skip formatting of parent spans not only in Json formatter implementation, but also for Full, Pretty and Compact.

I discovered that one PR was made with attempt to add these implementations: #3357 (unfortunately it wasn't finished), and there was an issue asking for such functionality: #2805

As I see, such implementations are wanted by community, that's why I decided to contribute them.

Solution

Solution is simple and straightforward - I extracted display_span_list boolean flag from Json formatter to main Format struct which later used in all FormatEvent trait implementations.