Implement Call Heirarchy and Type Heirarchy members

[baronfel]

We updated to a version of Ionide.LanguageServerProtocol that supports Call Hierarchy and Type Hierarchy methods.

• textDocument/prepareCallHierarchy
• callHeirarchy/incomingCalls
• callHeirarchy/outgoingCalls
• textDocument/prepareTypeHierarchy
• typeHeirarchy/supertypes
• typeHeirarchy/subtypes

Example docs:

• Call hierarchy example
• Type hierarchy example

[github-actions]

🤖 This is an automated response from Repo Assist.

Partial progress update on this issue — worth tracking what's been completed and what remains.

Call Hierarchy — ✅ Implemented

All three Call Hierarchy methods are live in FSAC:

• textDocument/prepareCallHierarchy — identifies the symbol at cursor
• callHierarchy/incomingCalls — merged in an earlier release
• callHierarchy/outgoingCalls — added in #1418, shipped in v0.83.0

Type Hierarchy — ❌ Not yet implemented

The three Type Hierarchy methods are currently stubbed out as notImplemented:

• textDocument/prepareTypeHierarchy
• typeHierarchy/supertypes
• typeHierarchy/subtypes

For F# this would map to:

• Supertypes: base classes and implemented interfaces (available via FSharpEntity.BaseType and .DeclaredInterfaces)
• Subtypes: this is harder — FCS has no index of derived types; you'd need to scan the whole workspace for types that inherit from the given type (similar to how "Find All References" works today)

If someone wants to take this on, AdaptiveFSharpLspServer.fs around line 2498 is a good starting point. The FCS APIs you'd need are on FSharpEntity. Happy to provide more guidance if helpful!

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