Add logging APIs for custom operators (#14416)
### Description
Add logging APIs for custom ops.
This PR introduces a `OrtLogger` type, which can be retrieved from a
`OrtKernelInfo` or `OrtKernelContext`. The kernel info's logger is the session logger stored
in the execution provider. The kernel context's logger is a run logger.
### Motivation and Context
Allows custom ops to log information in a manner consistent with
built-in ops.
Example usage in custom op:
```C++
struct MyCustomKernel {
MyCustomKernel(const OrtApi& api, const OrtKernelInfo* info) {
Ort::ConstKernelInfo kinfo(info);
this->logger_ = kinfo.GetLogger();
// ...
ORT_CXX_LOGF_NOEXCEPT(this->logger_, OrtLoggingLevel::ORT_LOGGING_LEVEL_ERROR, "Error: %s", err_msg);
}
void Compute(OrtKernelContext* context) {
ORT_CXX_LOG(this->logger_, OrtLoggingLevel::ORT_LOGGING_LEVEL_VERBOSE, "Calling compute...");
// ...
}
// ...
private:
Ort::Logger logger_;
};
```
