* fix: Add support for get_hl_defs in nvim 0.8
nvim-tree is using `nvim_get_hl` which was introduced in nvim 0.9 to
replace the unstable `get_hl_defs` in the following [commit](https://github.com/neovim/neovim/pull/22693/files).
Unfortunately this raises an error in 0.8 nvim versions due to the
function not existing.
```
Failed to run `config` for nvim-tree.lua
...are/nvim/lazy/nvim-tree.lua/lua/nvim-tree/appearance.lua:199: attempt to call field 'nvim_get_hl' (a nil value)
stacktrace:
- ~/.config/nvim/lua/confidenceman02/plugins/nvim-tree.lua:14 _in_ **config**
- ~/.config/nvim/lua/confidenceman02/lazy.lua:14
```
- Fall back to get_hl_defs when detecting 0.8
- Set the 'link' property to nil to emulate `link = false` in
`builder.lua`
* fix(#2415): nvim 0.8 highlight overhaul support, limited to only show highest highlight precedence
---------
Co-authored-by: Jaime Terreu <jaime@terreu.com>
Co-authored-by: Alexander Courtis <alex@courtis.org>
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