GetOrDefaultBool extract the value of a protobuf `optional bool` field with a fallback value if absent.

ParseGitURL this takes a Git url (GitHub) for now and converts it into the struct ParsedGitURL This can in the future be extended to GitLab or BitBucket or any other Git Host.

ParseOutTagBranchOrCommit splits the string around "@" and then split the after string around "/".

MinimumSubPathsForValidGitURL for a valid GitURl we need it to look like github.com/author/repositoryName the last two are the minimum requirements for a valid Startosis URL.

ParsedGitURL an object representing a parsed moduleURL.