deps: Add set -x for installation commands

[seemethere]

Adds set -x for all installation commands in install_requirements.sh so that users can see what's actually being installed and can help debug when they run into any issues.

NOTE: This doesn't turn it on for all of the script (since that'd be overbearing) but rather turns it on specifically when installing things.

This also adds "set -eou pipefail" to the top of the script which is a recommended paradigm for all bash scripts since it adds things like error on exit, error on undefined variable, and propagation of errors on pipe failure.

https://explainshell.com/explain?cmd=set+-euo+pipefail

[pytorch-bot[bot]]

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchchat/993

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As of commit f6a0049444f0866d47ff68a8d6fe34cc5c48d904 with merge base 35db0389ae20be1247bd5ce936e479a76d947c7d (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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