DEFAULT_FORWARDED_PORT_FILEPATH global variable has side effects

[Steinhagen]

We are happy to answer your questions about the code or discuss technical ideas.

The following commit introduces the DEFAULT_FORWARDED_PORT_FILEPATH global variable that has side effects (generates directories due to VPNExecutionEnvironment()). As a result, every time you import the core python module, the directories will be generated:
https://github.com/ProtonVPN/python-proton-vpn-api-core/commit/2bed80d42ef199ea1d8d90e13be843cae3e3850c#diff-a477ea526f47d9a15ba19e31f1e9a374bdf99f676be865d5b99563a665709cd3R26

Please complete the following checklist (by adding [x]):

• I have searched open and closed issues for duplicates
• This isn't a feature request
• This is not a report about my app not working as expected

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