Add methods to IdentifierDummy, an Exception, a utility method

[little-pinecone]

• Add ISSN, ISBN, ISMN, ISNI, ORCID, GTIN8, GTIN13, GTIN14, UPN to the IdentifierDummy.
• Add check digit formulae based on MOD 11, MOD 11-2, MOD 10 algorithms.
• Add InvalidDefinitionException to be used when a definition can't be resolved properly.
• Add StringFormatter::insertEveryFourCharacters utility method to insert separator to a string.

[sonarcloud[bot]]

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[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

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100.0% Coverage
0.5% Duplication