Implement the Q1 2021 small features release in the web debuggers

[leafpetersen]

This tracks implementation work for this feature set.

cc @sigmundch @annagrin @franklinyow

[leafpetersen]

@sigmundch any work planned here?

[sigmundch]

I don't believe there is any work needed here. Just to be sure @grouma @jacob314 - can you confirm?

[grouma]

There shouldn't be any work on our end.

[sigmundch]

Thanks!