Improve handling of ESM default exports

The IoC container now treats ESM exports as first class citizens and handles them in the following ways

ESM default export

export default class Foo {}
ioc.make('Path/To/Foo/Module') // Foo instance

export default class Foo {}
ioc.use('Path/To/Foo/Module') // Foo class

export default class Foo {}
ioc.useEsm('Path/To/Foo/Module') // { default: Foo }

Also, the fakes are limited to work with default exports. Named exports cannot be faked using ioc.fake

• refactor: cleaning up handling of esm default exports 57bee2b

v6.0.1...v6.0.2