[bug] Add Properties to cyclonedx.Vulnerability

[desenna]

Problem

This lib does not fully comply with the CycloneDX v1.4 schema.

The CycloneDX v1.4 schema defines "Properties" property in Vulnerability:
https://github.com/CycloneDX/specification/blob/1.4/schema/bom-1.4.schema.json#L1659-L1667
https://cyclonedx.org/docs/1.4/json/#vulnerabilities_items_properties

But the cyclonedx-go library has not yet been updated to support this:
https://github.com/CycloneDX/cyclonedx-go/blob/master/cyclonedx.go#L611-L629

Expected Behavior

Given:
var vuln cyclonedx.Vulnerability

Expect:
vuln.Properties is accessible for getting or setting

Actual Behavior / Steps to Reproduce

This snippet results in compiler error "vuln.Properties undefined (type cyclonedx.Vulnerability has no field or method Properties)":

func test() {
	var vuln cyclonedx.Vulnerability
	fmt.Println("len Affects:", len(*vuln.Affects))		// no compiler error
	fmt.Println("len Properties:", len(*vuln.Properties))	// compiler error!
}

Additional Information

1. the version you are using => github.com/CycloneDX/cyclonedx-go v0.5.2
2. your operating system and version => macOS Big Sur version 11.6.1
3. reproducible steps (1 2 3...) that cause the issue including any required files => see above
4. what you expected, versus what happened => see above
5. any relevant screenshots and other outputs => see above