As a Developer I'd like methods to check if a Version is Draft/Published/Archived to not have to check using the constants.

This is already on the Location object in API, and can be added in same way on VersionInfo.

Here is how it looks like in Location:

    /**
     * Returns true if current location is a draft.
     *
     * @return bool
     */
    public function isDraft()
    {
        return $this->status === self::STATUS_DRAFT;
    }

Class to contribute to (bottom, propoerties first): https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Publish/API/Repository/Values/Content/VersionInfo.php