`dotnet-gcdump collect --dsrouter` switch

[jonathanpeppers]

#5241 added a new --dsrouter switch to dotnet-trace.

Can we add the same to dotnet-gcdump?

> dotnet-gcdump collect --dsrouter android

Unrecognized command or argument '--dsrouter'.
Unrecognized command or argument 'android'

[steveisok]

/cc @lateralusX