[WIP] feat: add stardust behind flag "EXPERIMENTAL.stardust"

[mkg20001]

This adds support for the stardust protocol behind the flag
EXPERIMENTAL.stardust

This pr is part of the endeavour to replace ws-star with stardust for
the time being until a better solution is found.

See the discussion at
libp2p/js-libp2p-websocket-star#70 (comment)
for more information

Ref #1767

[alanshaw]

@mkg20001 does this have dependencies on other PRs that I need to consider?

[mkg20001]

Yes. libp2p/js-libp2p-crypto#125 (a pr where I need some help with adding the .encrypt() method with webcrypto) multiformats/js-multiaddr#78 (needs merge&release) multiformats/js-mafmt#35 (needs merge&release, depends on previous pr)

[daviddias]

Not in favor to merge this PR. Extra transports should be passed in through config.libp2p on the constructor, not through extra hard coded flags.

@mkg20001 wanna write instead a tutorial/example on how to use different transports for Js-ipfs and go through the path that a dev would take, making sure it is as nicer as it can be?

[alanshaw]

Unless I'm missing something, we don't need an experimental flag for this since you can enable it through constructor config already. I think we should instead add a stardust example and mention it in the README as an alternative transport that people can use.