[graphiql] Keep multiple responses from subscription

[Sytten]

Description

Currently I am using graphl-playground, its support of subscription displays all the responses received.
This is very useful since subscriptions can be very busy and you might miss some responses.
We might want to add a setting for the number of responses to keep in this history.

[Sytten]

@acao please link the original issue :)

[acao]

#2909

[Sytten]

This is not exactly the same issue though, the issue is keeping the tab alive when switching.
What I am asking can be done separately, it is about keeping multiple responses on the right panel.

[acao]

@Sytten ok in that case, the original duplicate issue is from 2017, I will find it when I get home, but this feature is requested almost monthly since the project was released

[acao]

#3601