ChannelPipeline.SyncOperations is missing `removeHandler(context:)`

[weissi]

Expected behavior

I should be able to synchronously remove a ChannelHandler by ChannelHandlerContext, just like I can with the regular async ops... Sadly, that's not possible :|.

The fix should be pretty straightforward: Adding a func removeHandler(context: ChannelHandlerContext) throws to SyncOperations.

[Lukasa]

Note that while this will still be a sync operation, it must return a future like its partner does.

[supersonicbyte]

Made a PR for this!

[ali-ahsan-ali]

Can this be closed?