[MANAGER] PipX

### Please confirm these before moving forward

- [X] I have searched for my feature proposal and not found a work-in-progress/duplicate/resolved/discarded issue.
- [X] This improvements refers to an existing feature. If you want to suggest a new feature, please use [this template](https://github.com/marticliment/WingetUI/issues/new?assignees=marticliment&labels=new-feature&projects=&template=feature-request.yml&title=%5BFEATURE+REQUEST%5D+%28Enter+your+description+here%29)
- [X] This improvements is not a bug. If you want to report a bug, please use [this template](https://github.com/marticliment/WingetUI/issues/new?assignees=marticliment&labels=bug&projects=&template=bug-issue.yml&title=%5BBUG%5D+%28Enter+your+description+here%29)

### Describe the improvement

[**pipx**](https://pypa.github.io/pipx/) is a specialized package installer. It can only be used to install packages with cli entrypoints.

Links:
- [PyPi](https://pypi.org/project/pipx/)
- [GitHub](https://github.com/pypa/pipx)

### Describe how this improvement could help users.

- Environment isolation for every package using venv
- Possibility to use different Python version (only Python 3.6+)
- It can only be used for packages with cli entries. No global libraries for coding being touched