feat: represent calls explicitly in model

[lars-reimann]

Closes partially #338.

Summary of Changes

• Replace originalFunction and originalParameter in model with callToOriginalAPI
• Fix a couple of issues with the Python codegen of constructors

[github-actions]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ CREDENTIALS	secretlint	yes		no	3.02s
✅ GIT	git_diff	yes		no	0.01s
✅ KOTLIN	ktlint	32	0	0	55.44s
✅ XML	xmllint	1		0	0.01s

See errors details in artifact MegaLinter reports on GitHub Action page
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff