Split DownloadZipped handler on methods. Add handler DownloadTar for downloading tar.gz archives. Make methods more universal for using in both implementations

Signed-off-by: Nikita Zinkevich <n.zinkevich@yadro.com>

@@ -130,2 +130,2 @@
-	// Zip compression.
-	cfgZipCompression = "zip.compression"
+	// Archive compression.
+	cfgArchiveCompression = "archive.compression"

@@ -65,0 +61,4 @@
+| Common headers                | See [bearer token](#bearer-token).                                                                                                                                        |
+| `X-Attribute-System-*`        | Used to set system FrostFS object attributes <br/> (e.g. use "X-Attribute-System-Expiration-Epoch" to set `__SYSTEM__EXPIRATION_EPOCH` attribute).                        |
+| `X-Attribute-*`               | Used to set regular object attributes <br/> (e.g. use "X-Attribute-My-Tag" to set `My-Tag` attribute).                                                                    |
+| `X-Attribute-Explode-Archive` | If this header is set, gate reads files from uploaded `tar.gz` archive and creates object for each file in it. Set FilePath attribute as relative path from archive root. |

@@ -115,3 +140,1 @@
-	c.Response.Header.Set(fasthttp.HeaderContentType, "application/zip")
-	c.Response.Header.Set(fasthttp.HeaderContentDisposition, "attachment; filename=\"archive.zip\"")
-	c.Response.SetStatusCode(http.StatusOK)
+	c.Response.Header.Set(fasthttp.HeaderContentType, "application/x-gzip")

@@ -165,1 +197,3 @@
-	}
+func (h *Handler) putObjectToArchive(ctx context.Context, log *zap.Logger, cnrID cid.ID, bufZip *[]byte, createArchiveHeader func(obj *object.Object) (io.Writer, error)) func(id oid.ID) bool {
+	return func(id oid.ID) bool {
+		log := log.With(zap.String("oid", id.EncodeToString()))

@@ -86,2 +88,4 @@
 	}
 
+	if header := c.Request.Header.Peek(utils.UserAttributeHeaderPrefix + explodeArchiveHeader); header != nil {
+		h.explodeGzip(c, log, bktInfo, file)