Initial checkin of perspective model.

[stevespringett]

Implements perspective model. Closes #736

[Copilot]

Pull request overview

This PR implements a new "perspective" model for CycloneDX 2.0, which enables domain-specific views into BOM documents. This allows different audiences to interpret and navigate data through their own conceptual lens using JSON path expressions and terminology mappings.

Changes:

• Added comprehensive JSON schema for perspective model with support for predefined and custom domains
• Integrated perspectives into main CycloneDX 2.0 schema
• Added "perspective" as a new external reference type
• Included test data demonstrating NTIA Minimum Elements perspective

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
schema/2.0/model/cyclonedx-perspective-2.0.schema.json	Complete JSON schema definition for the perspective model with domains, mappings, and relevance
schema/2.0/cyclonedx-2.0.schema.json	Integration of perspective schema into main CycloneDX schema
schema/2.0/model/cyclonedx-common-2.0.schema.json	Addition of "perspective" external reference type
tools/src/test/resources/2.0/valid-perspective-2.0.json	Test data showing NTIA Minimum Elements perspective with mappings

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[Copilot]

The root schema has "type": "null" which is incorrect. This schema defines object types (perspectives, perspective, etc.) in $defs, but the root type should not be "null". This should either be removed or changed to "type": "object" if the schema is intended to be used standalone. Given that this is a model schema meant to be referenced from other schemas, the type field at the root level should likely be omitted entirely.

Suggested change

"type": "null",