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

• [X] Added Tests
• [X] Added Documentation
• [X] Updated the changelog

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

:exclamation: 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

```diff @@ 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]

this change has been published in v1.12.0 thanks!