Refactor: Review semver comparations inside version.go to simplify migrations

[geaaru]

Currently, Best() method uses directly the semver API and we need to duplicate the workaround for build version with the underscore or invalid chars. The idea is to separate the logic to a unique and specific point. In this way, will be easier to replace semver with a fork or others

[geaaru]

Commit related to this: 129ca8da55ab5d54222b119671bf641aa1a683b0

[mudler]

Now with the versioner https://github.com/mudler/luet/pull/82, we can to move everything under the interface specification, so we can swap implementation easily