Embedded components allow users to leverage existing provider modules in
order to customize specific pieces of the dependency tree. This is
useful for keeping code DRY by not requiring providers to be copied
whenever a new module is needed for different purposes.

In order to embed a component, simply create a provider for an already
generated component, then add a `// @component` comment above the
provider much like one might do to specify that a provider should be a
singleton.

di assumes that you have access to the source for the embedded provider
as it must inspect that source in order to function properly. An error
will be returned if the source is not available or if it is not able to
be parsed.