Chart.yaml version should be parsed as semver so that matching it against requirements from chartfile.yaml works properly

[kklimonda-fn]

version for charts defined in chartfile.yaml is parsed via semver module, but version from any given chart's Chart.yaml is not, instead we do a string comparison: if chartYAML.Version == r.Version.String() {

This breaks for charts that are not 100% compliant with semver spec, and prefix version with v, for example jetstack/cert-manager defines version as v1.8.0 and currently this is never correctly matched by tanka, resulting in the chart being re-downloaded on every tk tool charts vendor run.