[otelfiber] fix: when body is stream middleware read everything into memory first, no streaming to client

[Alantoo]

Bug Description When application stream some file middleware reads all the streamed data into the memory to calculate response size which can consume all the available memory.

How to Reproduce Steps to reproduce the behavior:

• Stream some binary data from handler

Expected Behavior The middleware should skip response/request body size calculation when body is stream

Summary by CodeRabbit

• New Features
  • Enhanced request and response body size handling, including stream management for improved performance and resource utilization.
• Tests
  • Implemented new tests for streaming response body functionalities to ensure reliability and efficiency.

[ReneWerner87]

@Alantoo could you pls provide a unittest for this case?

[ReneWerner87]

@Alantoo friendly ping

[coderabbitai[bot]]

Walkthrough

The recent modifications introduce enhancements in handling request and response body sizes, particularly focusing on stream handling. This includes the introduction of a new struct for reading body stream sizes and improvements in testing capabilities for streamed response bodies by implementing a fake file interface and its concrete counterpart.

Changes

File(s)	Summary
otelfiber/fiber.go	- Added import for github.com/valyala/fasthttp and io - Added bodyStreamSizeReader struct and Read method - Modified handling of request and response body sizes, including stream handling
otelfiber/otelfiber_test/fiber_test.go	- Added a new fakeFile interface and its implementation fakeFileImpl with a Read method for streaming response body testing in the TestStreamedResponseBody function

🐇✨
In the realm of code, where streams do flow,
A rabbit hopped, with changes in tow.
"Let's measure," it said, "the size of the stream,
And test with a fake, a coder's dream."
With a hop and a skip, improvements were sown,
In the land of the fibers, where speed is grown.
🚀📈

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[Alantoo]

@Alantoo friendly ping

Hey. Sorry for long delay. Unfortunately had no time to work on it. I've pushed test to make sure response size computed in lazy way correctly. Please let me know if its fine or I should fix anything else. Thank you

[ReneWerner87]

@Alantoo pls fix this

[ReneWerner87]

@Alantoo

but we still support go 1.19.x