feat(client): Add Expect: 100-continue body wrapper - #321
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Add a request body wrapper which handles the
Expect: 100-continueheader flow.https://www.rfc-editor.org/rfc/rfc9110.html#name-expect
Also adds a utility
wrapwhich wraps a request body inExpectContinueBody, adds theExpect: 100-continueheader if not present, adds anon_informationalhook which signals to release the body.The
poll_frameimplementation parks the body until a signal is received/cancelled or a configured timeout elapses.Tests and a small example are added which demonstrate the behavior.