NAS-133888 / 25.10 / Initial round of disk enumeration improvements

[yocalebo]

We need to clean up how we enumerate disks. The SED investigations have exposed some very obvious issues in this area. This is the first step at adding stand-alone functions for this task. Please note that there is some duplicate functionality spread out all over our code in this area, but this will be used as the "source" moving forward. Most importantly, however, is that we have an oustanding SED unlock issue that we need to address but we need the get_disks function that I've written in here first.

On an internal system with ~1.2k+ disks, this takes ~0.23 seconds to complete. That's pretty darn good since it enumerates the serial AND "lunid" information of each disk in real-time. Careful reviewers will note that it uses the udevd database which is not the end of the world. Udevd does a ton of work caching the various disk information for us in 1 place. We shouldn't throw the baby out with the bathwater just because of some (very) painful issues that we've experienced in the past.

Subsequent PRs will follow to change existing code to use this new functionality. We've chosen to do it this way since enumerating disk information is a critical part of our product.

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-133888

[bugclerk]

This PR has been merged and conversations have been locked.
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