Enable value transfers in shared worker messages

[novemberborn]

From #2705, when publishing shared worker messages, or replying to an individual message, we should enable values to be transferred.

I don't think a second "transfer list" API is a good fit for the shared worker API. Perhaps we could add a chaining API like .transferring(buffer1, messagePort2).publish({buffer1, messagePort2}) and .transferring(buffer1, messagePort2).reply({buffer1, messagePort2}).

Values can only be transferred once. This also means we can't add this to the .broadcast() method.

See:

ava/plugin.d.ts

Line 35 in 0e5cc7d

reply: (data: Data) => PublishedMessage<Data>;

ava/plugin.d.ts

Line 41 in 0e5cc7d

publish: (data: Data) => PublishedMessage<Data>;

[novemberborn]

@dnlup let me know if you're still interested in working on this 😄

[dnlup]

It is a nice challenge, but I am a little swamped atm. I hope to be able to get at it soon.