* BAEL-7598 Check if a number is a perfect number
* add stream based method. refactor UT
* refactor UT using bdd style
* removes public modifier
* add jmh benchmark
* use properties and remove uncessary configuration
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Co-authored-by: alexyang <alexyang0623@gmail.com>
Co-authored-by: travel2china <163321917+travel2china@users.noreply.github.com>