[cherry-pick] use the required instruction to determine if the environment fits the sample code's required.  (#32766) (#33451)

1 put a instruction # required: gpu(for example) in the sample code
2 this piece of code will only run in the GPU-equipped CI pipelines, and be omitted in other pipelines.
3 the CI pipelines can specify its capacity by shell environment variable SAMPLE_CODE_TEST_CAPACITY

2.1 文档改版方案

see #32766 for more infomation

* update testcases

* remove unused codes

* update the docstring for samcd_processor

* no need to import the six module

* 我也不知道为何有一个前导空格，但现在有单元测试，取消这个空格没啥问题

* add unittests for print_signatures; add the first case for 'required' mechanism when executing sample code testing

* there is no paddle installed in PR-CI-APPROVAL

test=document_fix

* print the real name for Functions instead of the ArgSpec

class function method

* some API's name is not __module__ + __name__

so, we disard them temporarily.

* update the logging format for console

* ommit the top level of paddle package.

* these APIs have been removed.

test=document_fix

* Another Error occerd

* print_signatures.py 's stdout is redirect to spec file, so should not print any other info.

so sad.

* print the error msg to stderr

* disable the __init__ magic method

* update unittest for sampcd_processor.py

update unittest for sampcd_processor.py

* PR-CI-APPROVAL 's python interpreter name is not 'python3'.

it's a python3.9;
it does not have paddle installed yet.

此句在CI流水线竟然不可以用。报python3找不到
此句在CI流水线竟然不可以用。因为环境没有安装paddle

* testing only extract api from __all__

paddle module(the top module) does not have __add__
test=document_fix

* should import paddle here

* update the mechanism of extractiong and executing for the sample-codes test.

更新抽取代码和执行代码的逻辑
优化输出打印

* good code style

* get_api_md5 should prefer use the real name rather than the alias names

* case for ArgSpec style. update the unittests

test=document_fix

* skip paddle.Tensor.<lambda>

* some file may not exists. such as version.py, it's generated by setup.py

* debug mode

* add unittests for sampcd_processor.py

* add test cases for sampcd_processor

* add test cases for sampcd_processor

* add testcases

* add test cases

* add testcases

* add testcases

* refactor, add testcases

* add import

* all files map to pool. dont split manually

* __all__ += another list

* add testcases

* add testcases

* handle个锤子啊

* this line should not removed

https://github.com/wadefelix/Paddle/commit/882e7f7c3be6c2415f58550f82be338b84f0c0ef#diff-cb0679475bf60202fd803ae05b9146989437c3f787d1502616be6c71c69d0fb1

* print -> logger

* regulate the logging infomation

* regulate the logging infomation

* logger to file

* logger

* threads or subprocesses number config

* follow the good code style

don't touch wlist.json

* run test_sampcd_processor.py, it's a unittest for sampcd_processor.py

* update unittest for sampcd_processor.py

test=document_fix