primary: refactor store and transport to use oci-layouts and add fileserver feature

minors:
* add optional 'extraImages' to ThickCharts
* refactor File content into generic getter interfaces
* refactor artifact.Config into an actual usable interface (by File content)
* refactor 'copy' cli command to use oras mappers
* refactor 'serve' cli command to server registry and/or fileserver

internal/getter/https.go

@@ -0,0 +1,58 @@
+package getter
+
+import (
+	"context"
+	"io"
+	"mime"
+	"net/http"
+	"net/url"
+	"path/filepath"
+	"strings"
+
+	"github.com/rancherfederal/hauler/pkg/artifact"
+)
+
+type https struct{}
+
+func (h https) Name(u *url.URL) string {
+	resp, err := http.Head(u.String())
+	if err != nil {
+		return ""
+	}
+
+	contentType := resp.Header.Get("Content-Type")
+	for _, v := range strings.Split(contentType, ",") {
+		t, _, err := mime.ParseMediaType(v)
+		if err != nil {
+			break
+		}
+		// TODO: Identify known mimetypes for hints at a filename
+		_ = t
+	}
+
+	// TODO: Not this
+	return filepath.Base(u.String())
+}
+
+func (h https) Open(ctx context.Context, u *url.URL) (io.ReadCloser, error) {
+	resp, err := http.Get(u.String())
+	if err != nil {
+		return nil, err
+	}
+	return resp.Body, nil
+}
+
+func (h https) Detect(u *url.URL) bool {
+	switch u.Scheme {
+	case "http", "https":
+		return true
+	}
+	return false
+}
+
+func (h https) Config(u *url.URL) artifact.Config {
+	c := &config{
+		Reference: u.String(),
+	}
+	return artifact.ToConfig(c)
+}