gh-43657: Add support for custom test case and runner in both DocTestSuite and DocFileSuite #133203
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allow users to extend the doctest functionality by providing their own test case and runner implementations, default behavior of
DocTestSuiteandDocFileSuitehas not been changedDocTestSuiteandDocFileSuite:test_case: Optional parameter to specify a customDocTestCase/DocFileCaseclassrunner: Optional parameter to specify a customDocTestRunnerclass📚 Documentation preview 📚: https://cpython-previews--133203.org.readthedocs.build/