Align WebSockets Next with Vert.x 4.5.16 close behavior

[emattheis]

This PR makes some minor changes in preparation for new WebSocket::close behavior in the forthcoming Vert.x 4.5.16 release. eclipse-vertx/vert.x#5609

• treat HttpClosedException as a "close failure"
• introduce CloseReason constants EMPTY (matches missing or 1005 status code) and ABNORMAL (matches 1006 status code)
• add support for configuring ClientOptions::setClosingTimeout

[mkouba]

This PR looks really good, thank you @emattheis!

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