add requirements/conformance classes/abstract tests/examples for WCMP2 ETS/KPI, WNM

[tomkralidis]

Generated PDF attached for reviewing in context.

[tomkralidis]

PR updated to reduce constraints for general reports, add Requirements Class for System Alerts (updated generated PDF attached for reviewing in context).

[tomkralidis]

TT-WISMD 2025-02-19

• pin CloudEvents schema ref
• int.wmo.wis.wme.event.wnm: should this be identified as just a schema check or full ETS?
• system alerts properties:
  • needs dedicated JSON schema
  • constrained to Global Services
  • properties
    • id
    • level (Python logging levels)
    • message (message text can be more strict [should match a regex/pattern?])
• producer: the centre identifier of the entity producing the event -> producer: the centre identifier of the entity producing the event notification
• target: the centre identifier of the intended target of the event -> target: the centre identifier of the intended target of the event notification
• Requirement 2A: clarify/reduce to less levels being per WTH (should monitor be added to WTH proper?)