Country list should has parent element

[hamidrezaghanbari]

Scenario: when we want to add padding to whole list(dropdown country list), and scrollbar. we need one parent element that doesn't exist in this package.

for more description i put this ui: without dropdown parent this ui could not implemented anyway.

PLEASE attention to space between scrollbar and edge of dropdown, and rounded dropdown box.

also country flag and dropdown icon should has customization props.