Add support for typeHierarchy/supertypes and typeHierarchy/subtypes and integrate those via the codeInsight.gotoSuper and codeInsight.lineMarkerProvider EPs.

[SCWells72]

JetBrains' IDEs provide extensive support for navigating up and down type hierarchy relationships. Some of this is already integrated via LSP4IJ, e.g., Go To Implementation(s) via #636, but others are missing. Minimally support for typeHierarchy/supertypes should be added and integrated into the IDE via the codeInsight.gotoSuper EP. I'm not sure whether or not typeHierarchy/subtypes would add much vs. what is already used for Go To Implementation(s).

Additionally it would be nice to add support for type/method hierarchy relationships in the editor gutter area via codeInsight.lineMarkerProvider and the information from these LSP features to provide clear visual representations of these type inheritance relationships.

[angelozerr]

Ctrl+H is implmented but typescript ls dosnt support it

[SCWells72]

Go To Super is actually Ctrl+U (Windows/Linux). Do you know if TypeScript supports typeHierarchy/supertypes? If not, this becomes less compelling for me, but it's certainly still useful for languages which do support these notions.

[angelozerr]

Yiu can see in lsp console that typescrpt ls dosnt support typeHierarchy