onnxruntime

9d0dc9f0 - Enable QNN EP weight sharing generation using public API (#23702)

Enable QNN EP weight sharing generation using public API (#23702) ### Description Enable QNN EP weight sharing generation using public API instead of internal interfaces, so that user can integrate into their own toolchain. The change is to share the QnnBackendManager across ORT sessions if ep.share_ep_contexts is enabled. And there is extra option to end the share so that we know when to remove the shared QnnBackendManager from the singleton. Change the tool name from onnxruntime_qnn_ctx_gen to ep_weight_sharing_ctx_gen, so that it can be shared for other EPs.