Wrap: Allow annotations parameter to accept specific fields

The annotations parameter changed form a bool to specific annotation types. We need to wrap this in node-osrm, too.

Upstream:

• Issue https://github.com/Project-OSRM/osrm-backend/issues/3563
• Pull Request https://github.com/Project-OSRM/osrm-backend/pull/3628

Tasks

• node_osrm.cpp adapt comments
• node_osrm_support.hpp parse from Javascript-land
• adapt docs/api.md

Here’s the entry point where we throw an exception currently.

cc @karenzshea

[chaupow]

So shall we accept bool or an array of string?

Then, I will accept

var options = {
    annotations: true
};
var options = {
    annotations: ['distance', 'weight', 'node']
};
var options = {
    annotations: ['distance']
};

I will not accept

var options = {
    annotations: 'distance'
};
var options = {
    annotations: [true]
};

?

@karenzshea @TheMarex

[TheMarex]

@chaupow I would suggest not allowing string values but only boolean and array of strings to keep the API surface small.