fix: per method validations

[stambata]

per method validations

[stambata]

Maybe instead of defining method validations on port configuration level (as implemented in this PR) we can change the bus.registerLocal api to accept structured method definitions instead of plain functions.

E.g. In https://github.com/softwaregroup-bg/ut-bus/blob/master/serviceBus.js#L80

Instead of:

{
    'a.b.c': function() {},
    'x.y.z': function() {}
}

We can add support for registering modules represented with more complex structures like:

{
    'a.b.c': {
        handler: function() {},
        validation: ...
    },
    'x.y.z': {
        handler: function() {},
        validation: ...
    }
}

This way we can we add message validations on method level and leave each module define it's own message formats without needing to import any validations in the http server