Data model for Purity-Information

[lukarade]

Is your feature request related to a problem?

To infer the Purity-Information as suggested in #6 a new data model is needed

Desired solution

The new data model should be able to represent all possible read and write accesses.
Therefore, it should consider all kinds of accesses:

• global variables
• attributes
• parameters
• fields

It should also be able to represent the reasons for impurity:

• variables (read/write)
• files (read/write)
• 'unknown'- calls (case if reason could not be inferred)
• function calls (which function with which arguments)

It should also be possible to identify an object, so each object should have its own unique ID.

Define the _purity data class in package-parser/package_parser/processing/api/model/.

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