fix(package-parser): visibility of function/parameters in re-exported classes

[lars-reimann]

Closes #628.

Summary of Changes

If a class that is declared in a private module is re-exported in a public one, all its functions and parameters are again made public as well. This fixes a regression introduced in #610.

[github-actions]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ CREDENTIALS	secretlint	yes		no	3.15s
✅ GIT	git_diff	yes		no	0.01s
✅ JSON	eslint-plugin-jsonc	2	0	0	10.85s
✅ JSON	jsonlint	2		0	3.18s
✅ JSON	prettier	2	0	0	6.52s
✅ JSON	v8r	2		0	1.7s
✅ PYTHON	bandit	4		0	0.32s
✅ PYTHON	black	4	0	0	0.43s
✅ PYTHON	flake8	4		0	0.46s
✅ PYTHON	isort	4	0	0	0.13s
✅ PYTHON	mypy	4		0	6.95s
✅ PYTHON	pylint	4		0	3.33s

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