[lldb] Take a sledgehammer approach to resizing the statusline (#146578)

Terminal resizing continues to be a source of statusline bugs, so much
so that some users have started disabling it altogether. Different
operating systems and terminal emulators exhibit subtly different
behaviors, making it nearly impossible to handle resizing reliably
across the board.

This patch sidesteps those issues by clearing the entire screen when the
terminal is resized. This avoids having to account for the previous,
potentially wrapped statusline, the underlying cause of many of the
aforementioned bugs.

The obvious downside is that this clears the on-screen history, but I
believe that’s a reasonable trade-off. Note that this only happens when
resizing the terminal; when launching LLDB, the statusline is drawn
without clearing the screen.

rdar://154778410

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