[CustomOp] Split build directory for each setup.py

[Aurelius84]

PR types

New features

PR changes

Others

Describe

What's New?

Before this PR, all setup.py in unittests share same build directory, which will lead to remove the directory by mistake while parallelling execute setup.py, for example on CI.

So we split them into independent sub-directory, such as

// For setup build
-- build
  |-- custom_relu2
      |-- relu2.so
  |-- multi_outs
  |-- ....


// For /root/.cache/paddle_extension

-- paddle_extension
  |--custom_relu2
     |-- relu2.so
  |-- multi_outs
  |-- ...

[paddle-bot-old]

Thanks for your contribution!
Please wait for the result of CI firstly. See Paddle CI Manual for details.

[chenwhql]

LGTM

[zhwesky2010]

LGTM