Review of 14-JULY-2023 PCIM Spec and Foundational spec about dev.pcim

[eldonmetz]

Thank you @bilhar97! I've created a PR with commits for many of these items.

What is left for discussion after the review of the changes to address the rest:

• 3. Section 7.4 Do we need a use case for updating an existing device-patient association?
• 7. Paragraph 760 (in original PCIM spec, carried over into Foundational spec). Is this section still relevant as is? Not sure what this means in the context of the new PCIM?
     “A device association can be reported as a point-in-time event, in which case a separate disassociate message is not required to delineate the end of the association. Alternatively, the association event message can convey a duration during which the association was in effect. The latter is equivalent to an associate/disassociate message pair and may be preferable for short duration associations (e.g., spot vitals collection).”