New BOM with Spec Version

[attiasas]

feat: add NewBOMWithSpecVersion for configurable BOM spec version

Summary

Adds NewBOMWithSpecVersion(specVersion SpecVersion) so callers can create a BOM with the correct JSON schema, XML namespace, and specVersion for any supported CycloneDX spec. NewBOM() is unchanged in behavior and still defaults to CycloneDX 1.7 by delegating to the new helper.

Changes

• Add NewBOMWithSpecVersion(specVersion SpecVersion) *BOM in cyclonedx.go
• Refactor NewBOM() to call NewBOMWithSpecVersion(SpecVersion1_7) instead of inlining field initialization
• Initialize JSONSchema, XMLNS, and SpecVersion from the specVersion argument via existing jsonSchemas / xmlNamespaces maps

Notes

• Non-breaking: NewBOM() behavior is preserved

[codacy-production]

Up to standards ✅

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