ORT Custom op APIs support get vector<string> type attributes of a node [Feature Request]

[AgFeather]

Describe the feature request

I am working at adding more custom ops with onnxruntime custom OrtApis.

Now we have a node with vector string type attributes but it seems that there is not any apis I can use to access this kind of attributes. I have been scan the onnxruntime_c_api.h file. it seems that we can only access the following 5 kind of attributes in a custom node:

float; int; string; vector<float>; vector<int>

by the following APi like:
 ORT_API2_STATUS(KernelInfoGetAttributeArray_float, _In_ const OrtKernelInfo* info, _In_ const char* name,
                  _Out_ float* out, _Inout_ size_t* size);
ORT_API2_STATUS(KernelInfoGetAttributeArray_int64, _In_ const OrtKernelInfo* info, _In_ const char* name,
                  _Out_ int64_t* out, _Inout_ size_t* size);

ORT_API2_STATUS(KernelInfoGetAttribute_float, _In_ const OrtKernelInfo* info, _In_ const char* name,
                  _Out_ float* out);
ORT_API2_STATUS(KernelInfoGetAttribute_int64, _In_ const OrtKernelInfo* info, _In_ const char* name,
                  _Out_ int64_t* out);
ORT_API2_STATUS(KernelInfoGetAttribute_string, _In_ const OrtKernelInfo* info, _In_ const char* name, _Out_ char* out,
                  _Inout_ size_t* size);

Describe scenario use case

what I really want is an custom Ort api to access vector attribute in a node, this api might be like:

ORT_API2_STATUS(KernelInfoGetAttributeArray_string, _In_ const OrtKernelInfo* info, _In_ const char* name,
                  _Out_ int64_t* out, _Inout_ size_t* size);