Add enable_dynamic_shapes To Model Config To Resolve CNN Memory Leaks With OpenVino EP

[narolski]

Is your feature request related to a problem? Please describe.
For some models (most notably, CNNs), OpenVino EP for ONNX Runtime produces significant memory leaks due to issues with memory de-allocation: openvinotoolkit/openvino#12307.

Describe the solution you'd like
OpenVino team has proposed to use enable_dynamic_shapes to resolve the issue: openvinotoolkit/openvino#12307. However, it is not currently supported by onnxruntime_backend. I'd like to be able to use this option in model config.

Describe alternatives you've considered
Usage of:

parameters { key: "enable_mem_arena" value: { string_value: "0" } }
parameters { key: "enable_mem_pattern" value: { string_value: "0" } }

did not help for OpenVino EP-based inference for onnxruntime_backend.