Apologies for the delay.

Changes

• Upgrade to ONNX Runtime v1.15.1.
• Added support for IoBinding.
• Unified input & output tensors under one struct, Value.
• Use "unified" bindings with better platform support and less jank.
• Remove fetch-models from default features: #59
• Added support for boolean inputs: #60
• Fixed a segfault when dropping ORT tensors after session: #50
• Rework execution providers to be much easier to use.
• Added support for OpenVINO execution provider.
• Added support for loading models with in-memory external initializers (can be used to load LoRAs, for instance)