Provide xterm "titeInhibit" feature

[mitchellh]

Discussed in #4498

^{Originally posted by linsomniac January 3, 2025}
xterm provides a configuration option called "titeInhibit" which blocks the "ti" and "te" termcap entries, which prevents programs from using the alternate screen. Search for "titeInhibit" here for more information: https://www.x.org/archive/X11R6.7.0/doc/xterm.1.html

I've always found it preferable to be able to exit "man foo" or "vi bar" and have the contents I was just seeing on my screen remain on my screen for reference. I realize this can be implemented by setting LESS="-X" or modifying the terminfo to remove ti/te, but the ability to set it as a terminal preference and have it enforced across all systems/sessions/users in xterm has been really nice.

Implementation Notes

We should look at xterm's source code (MIT licensed) in all the places this configuration affects to ensure we did the right thing.