Introduced additional package version strategies

[kstanikviacbs]

🚀 Description

Current implementation hardcodes and thus supports only one package versioning strategy - from. Use cases of plugin might require support whole bunch of different versioning strategies described here: https://docs.swift.org/package-manager/PackageDescription/PackageDescription.html

📄 Motivation and Context

This change attempts to introduce supporting them while still keeping plugin UX friendly.

🧪 How Has This Been Tested?

I haven't introduced any additional unit tests to cover new logic, instead - performed smoke tests across all new strategies locally. Please do let me know if additional coverage is required.

📦 Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

✅ Checklist

• [x] My code follows the code style of this project.
• [] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.