[WIP] Select Operator (do not merge)

[cs2be]

This is a work in progress

• Add Python API for select
• Add select operator
• Add unit tests for select (Fibonacci sequence) in both python and c++

[CLAassistant]

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1 out of 3 committers have signed the CLA.

:white_check_mark: varunarora
:x: Abhinav Arora
:x: cs2be

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[paddle-bot[bot]]

很抱歉，经过我们的反复讨论，你的PR暂未达到合入标准，请阅读飞桨原生算子开发规范，你可以重新提交新的PR，我们先将此PR关闭，感谢你的贡献。 Sorry to inform you that through our discussion, your PR fails to meet the merging standard (Reference: Paddle Custom Operator Design Doc). You can also submit an new one. Thank you.