Node.js bindings should make binaries easily accessible

[daniel-j-h]

At the moment using the pre-built osrm binaries we ship with the bindings are cumbersome to use

./node_modules/osrm/lib/binding/osrm-extract ..

we should make that easier for users - looks like there is a bin field we should use:

https://docs.npmjs.com/files/package.json#bin
https://docs.npmjs.com/files/package.json#directoriesbin

[danpat]

The approach taken by #4386 unfortunately didn't work - the bin symlinking step tries to occur before node-pre-gyp has downloaded the binaries, and npm throws an error.

I described some more detail here: #4386 (comment)

TL;DR - if we want convenient binaries in the PATH in node_modules/.bin, we'll need to create wrapper scripts that can be installed by npm happily, and know how to call the actual binaries that will be downloaded later in the installation.

I've reverted the original PR for now to unblock OSRM 5.11

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