`--annotations` flag

Is your feature request related to a problem? Please describe. For debugging purposes it would be really nice to have a --annotations flag to see which AST elements the resolver annotated during the compilation. The "tricky" part here is that the type_map and type_hint_map fields within the AnnotationMapImpl have no AstNode element stored directly inside it but rather a reference in the form of a AstId. Hence a mapping would be required to print the AST element and its annotation.

Describe the solution you'd like cargo r -- <input file> --annotations should print all annotations for the given input file(s)