fix(popup): support relative: cusror on vim

[Warashi]

This PR adds support for popup.open's relative option on vim.

[coderabbitai]

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[Warashi]

I tested Vim's behavior with the script below and got a weird result.

script

set lines=100 columns=100
call append(0, [
      \ '0123456789',
      \ '0123456789',
      \ '0123456789',
      \ '0123456789',
      \ '0123456789',
      \ '0123456789',
      \ '0123456789',
      \ '0123456789',
      \ '0123456789',
      \ '0123456789',
      \ ])
call cursor([5, 5])
echo popup_create('a', #{line: "cursor+3", col: "cursor+3"})->getwininfo()
echo getcurpos()
quitall!

shell command to run the above script

vim -V10 -u NONE -i NONE -N -n -e -s -S test.vim

result

Opening the X display failed 
line 0: sourcing "test.vim"
[{'winnr': 0, 'variables': {}, 'botline': 1, 'height': 1, 'bufnr': 2, 'winbar': 0, 'width': 1, 'leftcol': 0, 'tabnr': 0, 'quickfix': 0, 'topline': 1, 'loclist': 0, 'wincol': 4, 'winrow': 4, 'textoff': 0, 'winid': 1001, 'terminal': 0}]
[0, 5, 5, 0, 5]

When I did the same thing in the cmdline, I got another result.

[{'winnr': 0, 'variables': {}, 'botline': 1, 'height': 1, 'bufnr': 2, 'winbar': 0, 'width': 1, 'lef
col': 0, 'tabnr': 0, 'quickfix': 0, 'topline': 1, 'loclist': 0, 'wincol': 8, 'winrow': 8, 'textoff't
 0, 'winid': 1001, 'terminal': 0}]                                                                 :
[0, 5, 5, 0, 5]

[Warashi]

The 7 comes from the nvim's test result.