fix: modify overflowing_shr to fix overflow check

[tcoratger]

Motivation

overflowing_shr algorithm seems to give incorrect overflow results: #337.

Should close #337.

Solution

• Added code to evaluate overflow for shift operation.
• This addition enables the identification of a floating-point outcome by isolating the most significant bit of the shifted limb.
• If the least significant bit of the shifted limb is non-zero, overflow is set to true, indicating a floating-point result.
• Enhances the functionality of the overflowing_shr function to differentiate between floating-point and integer outcomes after the shift operation.

This enhancement improves the functionality of the overflowing_shr method, providing a mechanism to determine whether the result represents a floating-point or integer value.

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.57%. Comparing base (4f2b31d) to head (c9f9fa4).

❗ Current head c9f9fa4 differs from pull request most recent head 0e515e0. Consider uploading reports for the commit 0e515e0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #347      +/-   ##
==========================================
+ Coverage   79.45%   79.57%   +0.12%     
==========================================
  Files          55       55              
  Lines        5578     5666      +88     
==========================================
+ Hits         4432     4509      +77     
- Misses       1146     1157      +11     

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[prestwich]

Edited the changelog to move the line to the unreleased section.

[prestwich]

this change has been published in v1.12.0 thanks!