ENH: Add "layout" mode for text extraction #4198

Job	Run time
Build & verify package	10s
Check code style issues	18s
pytest on windows	4m 50s
pytest on 3.7 (crypto-lib: cryptography)	3m 23s
pytest on 3.8 (crypto-lib: cryptography)	3m 44s
pytest on 3.9 (crypto-lib: cryptography)	3m 29s
pytest on 3.10 (crypto-lib: cryptography)	3m 47s
pytest on 3.11 (crypto-lib: cryptography)	3m 30s
pytest on 3.12 (crypto-lib: cryptography)	4m 50s
pytest on 3.7 (crypto-lib: pycryptodome)	3m 18s
pytest on 3.7 (crypto-lib: none)	4m 0s
Combine & check coverage.	10s
	35m 29s

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