Added classes to support observable:deviceType

[b0bkaT]

This Pull Request resolves all requirements of Issue #434 .

Coordination

• [x] Pull Request is against correct branch
• [x] Pull Request is in, or reverted to, Draft status before Solutions Approval vote has passed.
• [x] CI passes in UCO feature branch
• [x] CI passes in UCO current unstable branch (c5618b4)
• [x] CI passes in CASE current unstable branch tracking UCO's unstable as submodule (f3ccdc8)
• [x] Impact on SHACL validation reviewed for CASE-Examples
• [x] Impact on SHACL validation remediated for CASE-Examples (N/A)
• [x] Impact on SHACL validation reviewed for casework.github.io
• [x] Impact on SHACL validation remediated for casework.github.io (N/A)
• [x] Milestone linked
• [x] Solutions Approval vote logged on corresponding Issue (once logged, can be taken out of Draft PR status)

[b0bkaT]

I've implemented the changes as discussed a few days ago.

[ajnelson-nist]

Converting to Draft until Solutions Approval vote is logged.