ConstraintValidator function checks if the value is a correct version constraint.

DataStreamDoesNotExistValidator function checks if the package doesn't contain the data stream.

DefaultKibanaVersionConditionValue function returns a constraint.

GithubOwnerValidator function checks if the Github owner is valid (team or user).

PackageDoesNotExistValidator function checks if the package hasn't been already created.

SemverValidator function checks if the value is a correct semver.