Make completion-based send/receive functions public in URLSessionWebSocketTask

[lxbndr]

Completion-based send and receive are public in Apple Foundation.

Perhaps, availability should be added to the containing type, but I added it here for consistency with async counterparts.

[parkera]

It would be a good idea to add a test case that calls into these (if we don't have one already).

[lxbndr]

Test added. The test is the same as existing async-based test_webSocket, but ported to use completion handlers.

[jrflat]

@swift-ci please test

[jrflat]

@swift-ci please test

[lxbndr]

Windows CI failed on checkout:

C:\Users\swift-ci\jenkins\workspace\swift-corelibs-foundation-PR-windows\swift-docc failed (ret=1): ['git', 'rebase', 'FETCH_HEAD']
b'error: cannot rebase: You have unstaged changes.\nerror: Please commit or stash them.\n'

At least Linux is green. But I am not sure if it actually runs these tests. I don't see any output related to URLSession tests.

[jrflat]

LGTM thanks! Since web sockets are an experimental feature in curl, we'll need to run it with a curl where they're enabled to test it. I'll test it on a Fedora40 container to confirm

[lxbndr]

Just a small note: these API is what is actually used by async variants, which are already public. So I'd say it is pretty safe to open up a little more.

[jrflat]

Yeah that's true, the tests are also all green for me on a container with web sockets enabled. Looks good and let's merge after Windows passes (I think that issue's been resolved). Thanks again!

[jrflat]

@swift-ci please test Windows platform