Missing required fields cause `null` access errors

[dlg1206]

https://github.com/SoftwareDesignLab/SVIP/blob/b24c129a19f1e42aa75a24f0b8fcc4a4decc18c8/core/src/main/java/org/svip/sbom/builder/objects/SVIPSBOMBuilder.java#L149-L167

There are numerous null checks throughout SVIP since technically all fields are optional. We should require the builders to be instantiated with required fields for that schema, ie

// just example, may be missing addtional fields
var cdxB = new CDXComponentBuilder(name, type, ...);
var spdxB = new SPDXPackageBuilder(name, spdxid, ...);

This way required fields like names aren't null and add non-required, additional information via the .set and .add methods in the builder.

Resources

• Builders UML

Acceptance Criteria

• Identify required fields for each schema

Existing list can be found here

• Update builders with required fields