Add -t option to zfs destroy

[simons-public]

Resolves #9522 by adding an optional [-t type] option gate to the zfs destroy command. Checks the type of the supplied argument, then checks if the supplied type is the same or one of the aliases that are also used in zfs list. If the type doesn't match, it prints an error to stderr and exits. I am aware there have been PRs for this before, but I thought a simpler change might be more likely to be accepted.

Motivation and Context

This is a (hopefully) uncomplicated solution to the problem from issue #9522. It just checks the type early and exits if the type isn't a match. This makes something like using zfs list with grep or awk much less of a footgun for scripting and reduces the chances of destroying a dataset instead of a snapshot. I had written a small utility that does this for my own purposes, but when I saw that #9522 was labeled as good first issue I decided to submit a PR.

Description

This change adds a [-t type] option that exits if the supplied volume/filesystem/snapshot argument is not of the specified type.

How Has This Been Tested?

Tested by adding a functional test in zfs-test suite and running on linux. Passes all Github workflow actions that were not already failing. As an optional flag, should not affect any other items.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly. (zfs-destroy.8)
• I have read the contributing document.
• I have added tests to cover my changes. (zfs_destroy_017_pos.ksh)
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.