Context cancellation during reading range reading large files (#7093)

* context cancellation during reading range reading large files

* address comments

* cancellation for fuse read

* fix cancellation

* pass in context for each function to avoid racing condition

* Update reader_at_test.go

* remove dead code

* Update weed/filer/reader_at.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/filer/filechunk_group.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/filer/filechunk_group.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* address comments

* Update weed/mount/weedfs_file_read.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/mount/weedfs_file_lseek.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/mount/weedfs_file_read.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/filer/reader_at.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/mount/weedfs_file_lseek.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* test cancellation

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

weed/command/filer_cat.go

@@ -3,14 +3,15 @@ package command
 import (
 	"context"
 	"fmt"
+	"net/url"
+	"os"
+	"strings"
+
 	"github.com/seaweedfs/seaweedfs/weed/filer"
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
 	"github.com/seaweedfs/seaweedfs/weed/wdclient"
 	"google.golang.org/grpc"
-	"net/url"
-	"os"
-	"strings"
 
 	"github.com/seaweedfs/seaweedfs/weed/security"
 	"github.com/seaweedfs/seaweedfs/weed/util"