refactor: use vim._with where possible

This mostly means replacing `nvim_buf_call` and `nvim_win_call` with
`vim._with`.

runtime/lua/vim/_inspector.lua

@@ -84,7 +84,7 @@ function vim.inspect_pos(bufnr, row, col, filter)
 
   -- syntax
   if filter.syntax and vim.api.nvim_buf_is_valid(bufnr) then
-    vim.api.nvim_buf_call(bufnr, function()
+    vim._with({ buf = bufnr }, function()
       for _, i1 in ipairs(vim.fn.synstack(row + 1, col + 1)) do
         results.syntax[#results.syntax + 1] =
           resolve_hl({ hl_group = vim.fn.synIDattr(i1, 'name') })