refactor: adapt to deprecated jump_to_location

[tris203]

Description

vim.lsp.util.jump_to_location was deprecated in neovim/neovim#30877
This replaces it with vim.lsp.util.show_document which jump_to_location uses anyways.

The underlying function is available in 0.9

There are also some associated type annotation changes.

I also changed the return to an empty table rather than nil for some lsp complaints although functionally it remains the same

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

gd's in 0.9, 0.10 and HEAD

Configuration:

• Neovim version (nvim --version):
• Operating system and version:

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)

[tris203]

I tried to generate docs locally, it picked up some changes but CI still didn't like it.

[jamestrew]

Thanks