[ALGOS-tmp] feat(algos): Improve the LCC and Triangle Count Algortihm;

[xuanleilin]

PR Summary

• ALGOS-265 and ALGOS-268
  • This is a temporary PR created for the upcoming demo by Mingxi at the SF Big Analytics July event. In case PRs #156 and #163 are not merged into tg_4.1.0_dev in time, I have merged them into this single PR for demonstration purposes only. This PR will not be merged into tg_4.1.0_dev and will be closed after the demo.

PR Checklist

• Added comments for more comprehensible code.
• Added unit and/or regression tests.
• (Optional) Notified Doc/Prod team, if this PR contains any new features.

What is the behavior change?

Other information:

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