[Master] Added ::GCD and ::LCM: <numeric> contains GCD and LCM implementation

[mozga-intel]

Description

This pull request includes the greatest common divisor implementation (std::gcd) of the integers m and n and computes the least common multiple (std::lcm) of the integers m and n. If MxNet's project is built with c++17, then support is enabled. Following implementation works fine for a given test cases: __gcd(5, 0) == 5 && __gcd(0, 5) == 5 && __gcd(0, 0) == 0;

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

Changes

• Feature1, tests, (and when applicable, API doc)
• Feature2, tests, (and when applicable, API doc)

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

[mxnet-bot]

Hey @mozga-intel , Thanks for submitting the PR
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[mozga-intel]

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[mozga-intel]

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[mozga-intel]

@barry-jin Could you please review it?

[barry-jin]

LGTM, Thank you!
By the way, you know how much can be improved with std::lcm and std::gcd?