filters: address TODO in ModelOutlierRemoval compare content

[Stado1]

In test_model_outlier_removal.cpp there was a TODO for the comparison of two point contents. This PR implemented that comparison by:

• Sorting RANSAC inliers to be in the same order as the filtered output
• Using ASSERT_EQ for size verification to prevent out of bound access in the for loop
• Comparing individual point coordinates using EXPECT_FLOAT_EQ

[mvieth]

Looks good to me, thank you!