Add Additional MediaType and DeviceType variants; upgrade nix and strum

[iamjpotts]

• Vendor can now Display
• Rename Vendor:Vbox to Vendor::VirtualBox
• Rename Vendor::None to Vendor::ATA to match its vendor string
• Make Device::vendor an Option that defaults to Option::None instead of Vendor::None when vendor is unknown
• Add MediaType::Optical for when a CD or DVD drive (or a virtual variant of the same) is detected
• Add MediaType::Partitions to represent detection of a partition table on a device
• Add MediaType::Partition to represent when a device represents a partition
• Rename MediaType::Virtual to MediaType::Qemu to distinguish it from Virtual Box media
• Add MediaType::VirtualBox
• Add MediaType::Unrecognised with a field to expose the vendor of unrecognized media
• MediaType can now Display
• Add DeviceType::Unrecognised to expose the value of a device type that is not represented as an enum variant

MediaType::Unknown still exists but is now only used when the matching rules don't have any input to work with.

• Upgrade nix from 0.23 to 0.26. There is a newer version 0.27 but it has breaking changes.
• Upgrade strum from 0.24 to 0.25
• Update the cargo edition from 2018 to 2021

udev cannot be easily upgraded; there is a breaking change to Enumerator ownership related scan_devices which will require a significant refactor to some of the _iter functions.

Lastly I bumped the crate version from 0.11 to 0.12.0 to represent that this is a breaking change. [edited this comment to reflect your feedback]

[iamjpotts]

I've squished the two commits into one and changed the version to 0.12.0

In my own repos I often have a pre-release suffix on the version while there are unpublished changes in the default branch, but everyone's processes can be different.

[iamjpotts]

@cholcombe973

Doing a bit more experimentation on more hardware and VMs. I think i'm going to make a revision to the PR and can improve the media type matching rule.

In the mean time, it would be helpful for CI to be enabled. It's disabled due to this being my first PR to this repo.

[cholcombe973]

Sure no problem. I thought I enabled it already but I clicked it again.

[iamjpotts]

@cholcombe973 i've made my updates to the matching rules and enum variants. They're not perfect but they should be an improvement.

Tested on VirtualBox, a server with a raid controller, and a consumer desktop.

[iamjpotts]

Added FilesystemType::Luks and deduplicated FilesystemType::to_str / impl fmt::Display for FilesystemType