[NNAPI EP] Add leakyRelu support (#16533)
### Description
<!-- Describe your changes. -->
As title.
ONNX definition:
https://github.com/onnx/onnx/blob/2e9a6757ad33ef4bc0c4a4ecc61837f79885a82a/onnx/defs/math/defs.cc#L330
### 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. -->
CoreML has support and some super resolution models use it.
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Co-authored-by: rachguo <rachguo@rachguos-Mac-mini.local>
Co-authored-by: rachguo <rachguo@rachguos-Mini.attlocal.net>
