Tracking issue for supporting user-expressions in other kernels

[agoose77]

JupyterBook 1 (myst-nb) and MyST-MD use the user-expressions kernel protocol feature to evaluate expressions with an {eval} role. This is supported in IPyKernel, but other kernels may/do not yet have support for it.

• IRkernel -- 🔨 Add support for user-expressions IRkernel/IRkernel#742

We should add to this list as users mention them

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