feat: Added Stream Functionality

[zymawy]

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I run into in satiation where I just want to stream the merged files directly to the client. instead of saving it or forcing the client to save the merged file into their machine. by this PR, I just added the functionality the make response serve as streamed file

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This PR fixes/implements the following bugs/features

• [ x ] Stream File Into Browser

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• [x] Have you followed the guidelines in our CONTRIBUTING guide?
• [x] Have you lint your code locally prior to submission (make lint)?
• [x] Have you written new tests for your core changes, as applicable?
• [x] Have you successfully ran tests with your changes locally (make tests)?
• [x] I have squashed any insignificant commits
• [ ] This change has comments for package types, values, functions, and non-obvious lines of code