feat: Remove not stable appender implementation

[bokket]

Signed-off-by: bokket [email protected]

[Xuanwo]

The test failed again :(

go-service-hdfs/storage.go

Lines 70 to 82 in ceaedae

	defer func() {
	closeErr := f.Close()
	if err == nil {
	err = closeErr
	}
	}()
	o = s.newObject(true)
	o.ID = rp
	o.Path = path
	o.Mode = ModeRead | ModeAppend
	o.SetAppendOffset(0)
	return o, nil

What will happen if the closeErr is not nil?

[Xuanwo]

If the integretion tests of Append failed randomly, I think we need to remove the whole feature instead.