Hotfix/half precision inference

[lorenzomammana]

Summary

Fix half precison not working properly with onnx iobindings, add tests for half precision export, increase tolerance for fp32 export

Type of Change

Please select the one relevant option below:

• Bug fix (non-breaking change that solves an issue)

Checklist

Please confirm that the following tasks have been completed:

• I have tested my changes locally and they work as expected. (Please describe the tests you performed.)
• I have added unit tests for my changes, or updated existing tests if necessary.
• I have updated the documentation, if applicable.
• I have installed pre-commit and run locally for my code changes.