feat(llc): Add eagerError to uploadBatch #9
                
     Merged
            
            
          
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This commit introduces an
eagerErrorparameter to theuploadBatchmethod inAttachmentUploader.When
eagerErroris true, the upload stream will throw an exception and close immediately upon the first failed upload. IfeagerErroris false (the default behavior), failed uploads will be emitted asResult.failureand the upload process will continue for the remaining attachments.Additionally, the
attachmentsparameter inuploadBatchhas been changed fromList<StreamAttachment>toIterable<StreamAttachment>for better flexibility. A similar change was made to themergeextension method.