add support for watching the `funktion.yml` file and reloading on the fly if it changes

[jstrachan]

would be really handy for doing designers so that folks could make small changes & have it reflected immediately in the runtime in development

[davsclaus]

An idea could be to have some functionality in the future OOTB from camel itself also
https://issues.apache.org/jira/browse/CAMEL-10599