Improved defaulting to latest version by sorting the versions

[mario-eth]

Currently, when we will default to the latest inserted version in the backend when someone does:
soldeer install DEPENDENCY
In the next version we want to parse all versions and if they all can be parsed by semver then we consider this project "semver-compliant" and we sort the versions by semver, otherwise default to latest inserted version.

For this we will need a backend service as well that returns only the version tag of a project.

[mario-eth]

Depends on #103