feat(sb): move service-bus operations to message-context

[stijnmoreels]

Moves the Azure Service bus-specific operations (Complete, Abandon, Dead-Letter) to the message context, so that the following functionality can be made deprecated:

• Azure Service bus message template classes for regular/fallback message handlers, as these were solely used to trigger the Azure Service bus operations;
• General fallback functionality, as this is now also unnecessary for any of the 'messaging' implementations;

Relates to #547

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[stijnmoreels]

Waiting a bit on #268 to update the Service bus-specific operations in the feature docs.

Edit: should be #546 @fgheysels

[fgheysels]

Waiting a bit on #268 to update the Service bus-specific operations in the feature docs.

I don't understand what you mean here :) You're linking to a PR that has been merged ?