Require `CanonSourceFile` in `new_with_dep` signatures

[LesterEvSe]

Currently, the new_with_dep methods inside the CompiledProgram and TemplateProgram structs accept a standard SourceFile. However, the very first operation performed inside DependencyGraph::new is converting this SourceFile into a CanonSourceFile, which will fail if the user passes SourceFile::anonymous.