feat(alias): add DownloadConcurrency and DownloadPartSize option (#7829)

* fix(net): goroutine logic bug (AlistGo/alist#7215)

* Fix goroutine logic bug

* Fix bug

---------

Co-authored-by: hpy hs <hshpy.pengyu@gmail.com>

* perf(net): sequential and dynamic concurrency

* fix(net): incorrect error return

* feat(alias):  add `DownloadConcurrency` and `DownloadPartSize` option

* feat(net): add `ConcurrencyLimit`

* pref(net): create `chunk` on demand

* refactor

* refactor

* fix(net): `r.Closers.Add` has no effect

* refactor

---------

Co-authored-by: hpy hs <hshpy.pengyu@gmail.com>

drivers/github/driver.go

@@ -5,6 +5,13 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
+	"io"
+	"net/http"
+	stdpath "path"
+	"strings"
+	"sync"
+	"text/template"
+
 	"github.com/alist-org/alist/v3/drivers/base"
 	"github.com/alist-org/alist/v3/internal/driver"
 	"github.com/alist-org/alist/v3/internal/errs"
@@ -12,12 +19,6 @@ import (
 	"github.com/alist-org/alist/v3/pkg/utils"
 	"github.com/go-resty/resty/v2"
 	log "github.com/sirupsen/logrus"
-	"io"
-	"net/http"
-	stdpath "path"
-	"strings"
-	"sync"
-	"text/template"
 )
 
 type Github struct {
@@ -656,7 +657,7 @@ func (d *Github) putBlob(ctx context.Context, stream model.FileStreamer, up driv
 	contentReader, contentWriter := io.Pipe()
 	go func() {
 		encoder := base64.NewEncoder(base64.StdEncoding, contentWriter)
-		if _, err := io.Copy(encoder, stream); err != nil {
+		if _, err := utils.CopyWithBuffer(encoder, stream); err != nil {
 			_ = contentWriter.CloseWithError(err)
 			return
 		}