Use real types to parse labels

We were using `yaml.Unmarshal` on basic types or inline structs. This
was not efficient and not clear to defined what we expect in labels.
We now use types to unmarshal the labels.

Only the `values` label is, at this time, parsed by GetValuesFromLabel
because this `utils` function is clearly a special case.

generator/labelStructs/dependencies.go

@@ -0,0 +1,21 @@
+package labelStructs
+
+import "gopkg.in/yaml.v3"
+
+// Dependency is a dependency of a chart to other charts.
+type Dependency struct {
+	Name       string         `yaml:"name"`
+	Version    string         `yaml:"version"`
+	Repository string         `yaml:"repository"`
+	Alias      string         `yaml:"alias,omitempty"`
+	Values     map[string]any `yaml:"-"` // do not export to Chart.yaml
+}
+
+// DependenciesFrom returns a slice of dependencies from the given string.
+func DependenciesFrom(data string) ([]Dependency, error) {
+	var mapping []Dependency
+	if err := yaml.Unmarshal([]byte(data), &mapping); err != nil {
+		return nil, err
+	}
+	return mapping, nil
+}