Add comprehensive support for CycloneDX 1.7 specification

[alistair-mclean]

This implementation adds:

• Citations for data provenance and attribution
• Patent information and assertions
• Enhanced Cryptography Bill of Materials (CBOM) features
• Traffic Light Protocol (TLP) distribution constraints
• IKEv2 transform types for protocol properties
• Extended certificate lifecycle management
• New cryptographic asset tracking capabilities

Breaking changes:

• Default BOM version changed from 1.6 to 1.7
• NewBOM() now creates version 1.7 BOMs by default

Changes by file:

cyclonedx.go:

• Add SpecVersion1_7 constant
• Add BOM.Citations field for data attribution
• Add Component.IsExternal, Component.PatentAssertions, Component.VersionRange
• Add Service.PatentAssertions field
• Add Metadata.DistributionConstraints field
• Add ExternalReference.Properties field
• Enhance CertificateProperties with 11 new fields:
  • SerialNumber, CertificateFileExtension, Fingerprint
  • CertificateState, CertificateExtensions
  • RelatedCryptographicAssets
  • CreationDate, ActivationDate, DeactivationDate
  • RevocationDate, DestructionDate
• Enhance CryptoAlgorithmProperties with AlgorithmFamily, EllipticCurve
• Enhance RelatedCryptoMaterialProperties with Fingerprint, RelatedCryptographicAssets
• Enhance CryptoProtocolProperties with RelatedCryptographicAssets
• Enhance CipherSuite with TLSGroups, TLSSignatureSchemes
• Add new types:
  • Citation (8 fields: BOMRef, Pointers, Expressions, Timestamp, AttributedTo, Process, Note, Signature)
  • Patent (14 fields: BOMRef, PatentNumber, ApplicationNumber, Jurisdiction, PriorityApplication, PublicationNumber, Title, Abstract, FilingDate, GrantDate, PatentExpirationDate, PatentLegalStatus, PatentAssignee, ExternalReferences)
  • PatentFamily (5 fields: BOMRef, FamilyID, PriorityApplication, Members, ExternalReferences)
  • PatentAssertion (5 fields: BOMRef, PatentRefs, AssertionType, Asserter, Notes)
  • PatentAssertionType with 8 enum values
  • DistributionConstraints with TLP field
  • TLPClassification with 5 levels (Clear, Green, Amber, Amber+Strict, Red)
  • RelatedCryptographicAsset (Type, Ref)
  • CertificateState with predefined and custom state support
  • CertificateStateType with 6 enum values (pre-activation, active, suspended, deactivated, revoked, destroyed)
  • CertificateExtension with predefined and custom extension support
  • CertificateExtensionName with 10 common extensions
  • IKEv2TransformTypes (Encr, PRF, Integ, KE, ESN, Auth)
  • IKEv2Auth, IKEv2Enc, IKEv2Integ, IKEv2Ke, IKEv2Prf structs
• Add hash algorithms: HashAlgoStreebog256, HashAlgoStreebog512
• Remove unused PatentLegalEvent type

cyclonedx_json.go:

• Add SpecVersion1_7 to jsonSchemas map
• Add 1.7 case to BOM.UnmarshalJSON

cyclonedx_xml.go:

• Add SpecVersion1_7 to xmlNamespaces map
• Add 1.7 case to BOM.UnmarshalXML

cyclonedx_string.go:

• Regenerate with SpecVersion1_7 string representation

convert.go:

• Add version conversion for BOM.Citations (< 1.7)
• Add version conversion for Metadata.DistributionConstraints (< 1.7)
• Add version conversion for Component.IsExternal, PatentAssertions, VersionRange (< 1.7)
• Add version conversion for Service.PatentAssertions (< 1.7)
• Add version conversion for ExternalReference.Properties (< 1.7)
• Add convertCryptoProperties function for all CBOM 1.7 fields:
  • CryptoAlgorithmProperties.AlgorithmFamily, EllipticCurve
  • CertificateProperties (11 fields)
  • RelatedCryptoMaterialProperties.Fingerprint, RelatedCryptographicAssets
  • CryptoProtocolProperties.RelatedCryptographicAssets
  • CipherSuite.TLSGroups, TLSSignatureSchemes
• Add hash algorithm version support for Streebog algorithms (>= 1.7)

example_test.go:

• Update Example_encode expected output from 1.6 to 1.7 namespace

encode_test.go:

• Update all test expectations from 1.6 to 1.7

Addresses issue #247