Support sending stream

[pi0]

h3 support: h3js/h3#68 is landed for Node.js compatible environments.

We might need to improve unenv mocks as well to universally make stream support available.

Currently waiting for h3 Event API to be completed and especially with Event class we can leverage native web API for sending streams.

[pi0]

pining @danielroe @stafyniaksachato be on board with updates on this.

[enemy-senator92]

Hi there!

Can you please tell me if there are plans to improve this direction?

[theartkod]

same question, any updates here? @danielroe

[Hebilicious]

Looks like we could use https://github.com/ardatan/whatwg-node to support stream everywhere easily (or improve unenv/node-native-fetch)

[pi0]

Moving to #1327