fix: determine shopware project version regardless of setup

[shyim]

This should cover all edge cases to determine somehow with which Shopware version we are interacting. We want to have a Version Constraint so we try:

• is shopware/core required, take that constraint
  • If we cannot parse it (we don't support any composer version stuff), look into composer.lock for an exact version
  • If we cannot find Shopware in composer.lock, use Kernel.php of Shopware to get the fallback version.
  • When even that does not work, throw exception
• If shopware/core is not required,
  • Check for Kernel.php for the fallback version

So we get at an end a constraint. But we cannot compare a constraint against another constraint. Therefore, we need to resolve the constraint to the min version of Shopware. And with that version we do version comparison, if something is available.