ENH: Add Enforce from PDF2.0 in viewer_preferences (#2511) #4436

Job	Run time
Build & verify package	14s
pytest on windows	4m 59s
Check code style issues	38s
pytest on 3.7 (crypto-lib: cryptography)	3m 25s
pytest on 3.8 (crypto-lib: cryptography)	3m 55s
pytest on 3.9 (crypto-lib: cryptography)	3m 44s
pytest on 3.10 (crypto-lib: cryptography)	3m 45s
pytest on 3.11 (crypto-lib: cryptography)	3m 29s
pytest on 3.12 (crypto-lib: cryptography)	4m 40s
pytest on 3.7 (crypto-lib: pycryptodome)	3m 36s
pytest on 3.7 (crypto-lib: none)	3m 44s
Combine & check coverage.	16s
	36m 25s

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