fix(compare): ensure images are sorted without modifying input slices

[k1LoW]

This pull request refactors the imagesEqual function in compare.go to ensure that the original slices of images remain unmodified during comparison by copying and sorting them into new slices before performing equality checks.

Refactoring for immutability:

• compare.go: Updated the imagesEqual function to create copies of the input slices (images1 and images2) before sorting them. This prevents unintended modifications to the original slices during the sorting process.

[github-actions]

Code Metrics Report

	main (7c2ac62)	#276 (0b5859b)	+/-
Coverage	36.6%	36.8%	+0.1%
Code to Test Ratio	1:0.8	1:0.8	-0.1
Test Execution Time	9s	13s	+4s

Details

  |                     | main (7c2ac62) | #276 (0b5859b) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          36.6% |          36.8% | +0.1% |
  |   Files             |             17 |             17 |     0 |
  |   Lines             |           2319 |           2323 |    +4 |
+ |   Covered           |            851 |            855 |    +4 |
- | Code to Test Ratio  |          1:0.8 |          1:0.8 |  -0.1 |
  |   Code              |           4717 |           4721 |    +4 |
  |   Test              |           4177 |           4177 |     0 |
- | Test Execution Time |             9s |            13s |   +4s |

Code coverage of files in pull request scope (59.3% → 60.6%)

Files	Coverage	+/-	Status
compare.go	60.6%	+1.2%	modified

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Reported by octocov