Add support for TypeScript files

[nunoleong]

Currently, Dyson only loads routes from files with extension .js.
I'd like to express my route files as .ts, in TypeScript.

However, those files are not loaded.

I've traced to loader.js:8 where it calls

const rawConfigs = requireDir(module, path.resolve(configDir));

requireDir itself accepts an optional third parameter which is an object that allows defining which extensions to look for.

Changing it to
const rawConfigs = requireDir(module, path.resolve(configDir), {extensions: ['js','ts']});

Seems to have done the trick.

Is this something that could be somehow added to Dyson?