feat(stomp): add stomp via websocket example

[timonback]

This sets up an example project. Any help welcome to implement the plugin. The skeleton can be copied from any other plugin - for example sqs.

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[timonback]

Resolves https://github.com/springwolf/springwolf-core/issues/364

[timonback]

Requires:

• https://github.com/springwolf/springwolf-core/pull/797
• https://github.com/springwolf/springwolf-core/pull/796