Add checked arithmetic operations for Int and Int64

[yj-qin]

Closes #241

Summary by CodeRabbit

Summary by CodeRabbit

• New Features
  • Introduced safe arithmetic operations for integers, including absolute value, negation, addition, subtraction, multiplication, and division, with overflow handling.

[coderabbitai]

Walkthrough

The update implements checked arithmetic operations for Int and Int64 data types, ensuring safe handling of potential arithmetic overflows with the use of Option types. This includes functions for absolute value, negation, addition, subtraction, multiplication, and division.

Changes

Files	Change Summary
int/int.mbt, int64/...	New functions added for checked arithmetic operations (checked_abs, checked_neg, checked_add, checked_sub, checked_mul, checked_div)

Assessment against linked issues

Objective	Addressed	Explanation
Checked arithmetic operations for Int and Int64 (#241)	✅

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Recent Review Details

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between d7da7cc and efb019c.

Files selected for processing (2)

• int/int.mbt (2 hunks)
• int64/int64.mbt (2 hunks)

Files skipped from review as they are similar to previous changes (2)

• int/int.mbt
• int64/int64.mbt

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.15%. Comparing base (d7da7cc) to head (efb019c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #244      +/-   ##
==========================================
+ Coverage   82.83%   83.15%   +0.31%     
==========================================
  Files          50       50              
  Lines        2208     2244      +36     
==========================================
+ Hits         1829     1866      +37     
+ Misses        379      378       -1     

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