RecvBuffer simplifications [2/N]

[guhetier]

Description

Part of a series of PR to simplify the receive buffer code by unifying the handling of the different buffer modes where possible.

This change:

• introduces an iterator over the receive buffer chunk list. It provides a view to the contiguous spans of data in chunk list, skipping an initial offset
• refactors the read and write operations using the iterator
• introduce a validation function to enforce the receive buffer invariants consistently

Testing

CI

Documentation

N/A

[codecov]

Codecov Report

Attention: Patch coverage is 98.70130% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.90%. Comparing base (3785f6c) to head (3cfc8e3).

Files with missing lines	Patch %	Lines
src/core/recv_buffer.c	98.70%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4975      +/-   ##
==========================================
- Coverage   87.18%   85.90%   -1.29%     
==========================================
  Files          59       59              
  Lines       18011    17913      -98     
==========================================
- Hits        15703    15388     -315     
- Misses       2308     2525     +217     

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