Describe the bug
I have a equinox jax model I want to import into burn. I used jax2tf to get a tensorflow model, then tf2onnx to obtain the onnx file. When I try to import this into burn it panics with the message:

ERROR burn_import::logger: PANIC => panicked at /home/mrobins/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/burn-import-0.16.0/src/burn/ty.rs:123:19:
  "jax2tf_rhs_/pjit_silu_/Const_2:0" is not a valid Ident   

I'd imagine it is the ":" or "/" characters in the ident, which seem to be used to identify blocks and outputs in the model. Is this panic expected or a bug?

To Reproduce

You can get the onnx file here: https://github.com/martinjrobins/diffsol/raw/refs/heads/workspace/examples/neural-ode-weather-prediction/rhs.onnx

Then I read it in as per the onnx example: https://burn.dev/burn-book/import/onnx-model.html

Expected behavior

The model to import without panic

Desktop (please complete the following information):

• OS: Ubuntu
• Browser chrome
• Version 22.04

Additional context
Using burn v0.16.0