Move the jupytext-config helpers to a subpackage, and add tests (#1167) #92

Job	Run time
pre-commit / pre-commit	16s
pre-commit / lint-extension	2m 8s
codeql / codeql	3m 7s
test-unit-functional-integration / test-pip (3.11, unit)	2m 22s
test-unit-functional-integration / test-pip (3.11, functional)	3m 43s
test-unit-functional-integration / test-pip (3.11, integration)	3m 16s
test-unit-functional-integration / test-pip (3.11, external)	6m 29s
test-conda / test-conda (ubuntu-latest, 3.11)	11m 32s
test-pip / test-pip (3.8, ~=3.0)	9m 37s
test-conda / test-conda (macos-latest, 3.11)	19m 17s
test-pip / test-pip (3.9, ~=3.0)	9m 46s
test-ui / test-ui	3m 33s
test-conda / test-conda (windows-latest, 3.11)	13m 30s
test-pip / test-pip (3.10, ~=3.0)	9m 25s
test-pip / test-pip (3.11, ~=3.0)	9m 24s
test-pip / test-pip (3.12-dev, ~=3.0)	11m 39s
test-pip / test-pip (3.x, ~=2.0)	11m 16s
test-pip / test-pip (3.x)	11m 33s
test-pip / test-pip (3.x, true)	9m 46s
test-pip / test-pip (3.x, true)	12m 6s
build / build	3m 0s
	2h 46m 45s

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