Support version ranges in chart dependencies

[fstaudt]

Where possible, Helm documentation recommends to use version ranges instead of pinning to an exact version.

Version ranges are currently only supported for local and extracted JSON schemas.
It should also be supported for other dependencies with JSON schemas stored in external repositories.\

Plugin could retrieve the dependency version in Chart.yaml of dependency archive to define which version of the JSON schema should be downloaded from external repositories.
If version can't be retrieved from dependency archive, a fallback schema should be generated with a clear error message in description.