[PTEN] Add cpu context #38979
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[PTEN] Add cpu context #38979
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jim19930609
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PR types
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PR changes
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Describe
该pr改动总结如下：
1、platform::DeviceContext 移动到 pten::DeviceContext
2、添加 pten::CPUContext
3、platform::CPUDeviceContext 继承 pten::CPUContext
4、CpuContext适配过程中对现有框架的修改
Note（TODO）：
1、pten::DeviceContext::Alloc接口暂未实现，待TensorBase提供相关接口后添加；参考pr #39022 添加实现
2、pten::DeviceContext::GetPlace接口需评估是否需要删除以及如何删除，pten内部mutable_data以及storage仍然在用GetPlace接口；
3、pten::DeviceContext::Wait接口，在fluid框架内多处用到，无法删除，目前保留在pten::DeviceContext中。
4、如不需删除GetPlace接口，则后续会使用using platform::CPUDeviceContext=pten::CPUContext。