Resolve more declaration file types at build time

Should be possible to resolve some of the types in ts-morph's declaration file and resolve them at build time. This would help people's editors resolve types slightly faster.

For example, `NodeParentType` could probably be inlined.

Start by locating ts-morph's declaration file generation or build-time type-resolution entry points, then inspect how NodeParentType is represented. Identify which additional declaration types can be resolved safely during the build and compare editor type-resolution performance before and after; done means the selected types are inlined without changing their public meaning.

Written by the indexing model from the issue text.