fix: skip CIDSet generation for PDF/A3 subset

[florianbepunkt]

Fixes the second part of #1561. CIDSet is only generated for PDF/A subsets 1 and 2 (not 100% sure if it could be skipped for 2 as well).

I followed the contributing guide, but this did not work. All tests failed due to some jest config problem:

Jest encountered an unexpected token

    Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

Is the contributing guide up-to-date?

[blikblum]

Is the contributing guide up-to-date?

Yarn should be used.

A (simple) unit test with ranges in subsets 1, 2 and 3 are welcome

[smartmeta]

Would be nice to see this (and #1561) merged

[skch-17]

The same issue exists for subset 2.

@florianbepunkt Should the whole fix be applied for < 2?

[florianbepunkt]

The same issue exists for subset 2.

@florianbepunkt Should the whole fix be applied for < 2?

I believe so, but not 100% sure.

[carstenblt]

Indeed, validators complain when set to PDF/A-2 & PDF/A-3, but not PDF/A-1.

Can this be merged? I believe a lot of people are waiting for this to be able to create ZUGFeRD documents.

[liborm85]

Fixed by #1561 (comment)