Support for modals, overlapping windows

[rambhosale]

I was looking for a way to add a small modal window to show a confirmation window in bubbletea app, I looked for something similar but couldn't find any exact feature like it, the best bubbletea compatible option I found is https://github.com/erikgeiser/promptkit#confirmation-prompt
It is somewhat similar but doesn't achieve the same feature that I need, if there is an existing option please let me know.

for reference, I am listing some similar options
from github.com/jesseduffield/gocui

from https://github.com/rivo/tview

[meowgorithm]

Hi! Compositing is still a work in progress, however for now there's a PR in Lip Gloss that may get you most of the way there: charmbracelet/lipgloss#102. See also this note on how we recommend implementing it on your end.

Otherwise, please follow #79 for updates.

(Duplicate of #79)