refactor: use vim._with where possible

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

runtime/lua/vim/lsp/util.lua

@@ -640,7 +640,7 @@ function M.rename(old_fname, new_fname, opts)
     -- Rename with :saveas. This does two things:
     -- * Unset BF_WRITE_MASK, so that users don't get E13 when they do :write.
     -- * Send didClose and didOpen via textDocument/didSave handler.
-    api.nvim_buf_call(b, function()
+    vim._with({ buf = b }, function()
       vim.cmd('keepalt saveas! ' .. vim.fn.fnameescape(rename.to))
     end)
     -- Delete the new buffer with the old name created by :saveas. nvim_buf_delete and
@@ -1014,7 +1014,7 @@ function M.show_document(location, offset_encoding, opts)
     local row = range.start.line
     local col = get_line_byte_from_position(bufnr, range.start, offset_encoding)
     api.nvim_win_set_cursor(win, { row + 1, col })
-    api.nvim_win_call(win, function()
+    vim._with({ win = win }, function()
       -- Open folds under the cursor
       vim.cmd('normal! zv')
     end)
@@ -1334,7 +1334,7 @@ function M.stylize_markdown(bufnr, contents, opts)
   end
 
   -- needs to run in the buffer for the regions to work
-  api.nvim_buf_call(bufnr, function()
+  vim._with({ buf = bufnr }, function()
     -- we need to apply lsp_markdown regions speperately, since otherwise
     -- markdown regions can "bleed" through the other syntax regions
     -- and mess up the formatting