onnxruntime

d7029780 - [EP ABI] API to get external initializer info + lazy load external OrtValues (#25482)

[EP ABI] API to get external initializer info + lazy load external OrtValues (#25482) ### Description - Adds APIs to get information (file path, file offset, byte size) for initializers with data in external files. This allows EPs to do their own custom memory-mapping of initializer data. By default, EPs that don't have specific requirements can still use `ValueInfo_GetInitializerValue` to get an `OrtValue` with memory-mapped initializer data. - Updates `OrtGraph` to only load `OrtValue` for external initializers on demand. This prevents having to memory map all external initializers before the first call to `OrtEp::GetCapability`. Follow up to https://github.com/microsoft/onnxruntime/pull/25320 New API functions: | Function | Summary| |-----------|--------------| | `ValueInfo_GetExternalInitializerInfo` | Get `OrtExternalInitializerInfo` from `OrtValueInfo` (or `NULL`). Must be released with `ReleaseExternalInitializerInfo`| | `ReleaseExternalInitializerInfo` | Releases the `OrtExternalInitializerInfo` instance | | `ExternalInitializerInfo_GetFilePath` | Returns the relative path to the file that stores the initializer's data | | `ExternalInitializerInfo_GetFileOffset` | Returns the byte offset within the file where the initializer's data is stored | | `ExternalInitializerInfo_GetByteSize` | Returns the size in bytes of the initializer's data within the file | ### Motivation and Context <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. --> --------- Co-authored-by: Dmitri Smirnov <dmitrism@microsoft.com> Co-authored-by: Scott McKay <skottmckay@gmail.com>