feat(libhelm) import libhelm into CE pkg directory [EE-4650] (#8138)

* import libhelm and update some paths

* remove file

* update readme

pkg/libhelm/binary/show.go

@@ -0,0 +1,29 @@
+package binary
+
+import (
+	"github.com/pkg/errors"
+	"github.com/portainer/portainer/pkg/libhelm/options"
+)
+
+var errRequiredShowOptions = errors.New("chart, repo and output format are required")
+
+// Show runs `helm show <command> <chart> --repo <repo>` with specified show options.
+// The show options translate to CLI arguments which are passed in to the helm binary when executing install.
+func (hbpm *helmBinaryPackageManager) Show(showOpts options.ShowOptions) ([]byte, error) {
+	if showOpts.Chart == "" || showOpts.Repo == "" || showOpts.OutputFormat == "" {
+		return nil, errRequiredShowOptions
+	}
+
+	args := []string{
+		string(showOpts.OutputFormat),
+		showOpts.Chart,
+		"--repo", showOpts.Repo,
+	}
+
+	result, err := hbpm.run("show", args)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to run helm show on specified args")
+	}
+
+	return result, nil
+}