Split operator for ONNX models

[akaushikyu]

Prerequisites

Please make sure to check off these prerequisites before submitting a bug report.

• Test that the bug appears on the current version of the master branch. Make sure to include the commit hash of the commit you checked out.
• Check that the issue hasn't already been reported, by checking the currently open issues.
• If there are steps to reproduce the problem, make sure to write them down below.
• If relevant, please include the hls4ml project files, which were created directly before and/or after the bug.

Quick summary

Split operator for ONNX models.

Details

I am working with a YOLO model that has the split operator. However, it looks like HLS4ML does not have support for split operators (https://onnx.ai/onnx/operators/onnx__Split.html). Is there a workaround to deal with split operators at the moment?

Steps to Reproduce

Add what needs to be done to reproduce the bug. Add commented code examples and make sure to include the original model files / code, and the commit hash you are working on.

1. Clone the hls4ml repository
2. Checkout the master branch, with commit hash: [...]
3. Run conversion [...] on model file with code [...]
4. [Further steps ...]

Expected behavior

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Actual behavior

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Optional

Possible fix

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Additional context

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