Description

I noticed that the call hierarchy feature is implemented in the built-in code, but the type hierarchy is not. Although new pickers are no longer allowed to be added, I still want to be able to complete the hierarchy functionality of the language server.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list relevant details about your configuration

Configuration:

• Neovim version (nvim --version): v0.11.5
• Operating system and version:

MacOS Sequoia 15.6.1

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (lua annotations)