[QNN EP] Add support for GatherNd Op in QNN EP (#25635)
- Added new op builder for GatherNd Op
- Added unit tests for GatherNd and QDQ tests
- Disabled two tests in ORT test as QNN CPU does not support negative indices
### Description
Adding support for GatherNd op in QNN EP
### Motivation and Context
Currently GatherNd op is not supported in QNN EP and hence falls back to
ORT CPU.
