Release 3.0 of the SPDX model

Updated model diagrams to align with state of specification as of 02-…

…15-24 (spdx#643)

* Updated model diagrams to align with state of specification as of 02-15-24
Signed-off-by: Sean Barnum <sbarnum@mitre.org>

* Update diagrams per feedback

Remove the workgroup and examples
add packageVerificationExcludedFiles
datalicense cardinality
WithAddition updates

Signed-off-by: Gary O'Neall <gary@sourceauditor.com>

* Removed errant 'algorithm' property on PackageVerificationCode. 
Signed-off-by: Sean Barnum <sbarnum@mitre.org>

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Signed-off-by: Sean Barnum <sbarnum@mitre.org>
Signed-off-by: Gary O'Neall <gary@sourceauditor.com>
Co-authored-by: Gary O'Neall <gary@sourceauditor.com>