feat: support ghost text with noice

[Saghen]

Closes #939

@folke Curious on your thoughts on this, I've used an internal API (require('noice.ui.cmdline').position) but the result is quite promising! Perhaps this internal API could be made official? I've started using this with:

cmdline = {
  keymap = { 
    ['<Tab>'] = { 'accept' },
    ['<C-Space>'] = { 'show_and_insert' }
  },
  completion = {
    menu = { auto_show = false },
    ghost_text = { enabled = true },
  },
}

[folke]

Nice! Will check it out

[minusfive]

Nice! Will check it out

I'm so disappointed you didn't reply "Noice! ..."

[skbolton]

Is noice a requirement? I do not use it and now I am getting failures here

[krovuxdev]

@skbolton Hi, please check the issues section to report any problems you are experiencing. Also, please try with repro.lua

[Saghen]

@skbolton Does that commit resolve the issue for you?

[skbolton]

@Saghen no unfortunately. I am using this package as an input in my nix flake. I just pulled and rebuilt and I am getting failures here still.

For additional context the ghost text is showing for me

But when I press delete I get the error

I don't have any config around cmdline in my config