log stdout/err streams from raw kernel process

[rgbkrk]

A little collapsible logger inside the console dev tools:

/cc @Jaykul for review

I also had to make the kernelRefs have a subtyping constraint to allow them to be coerced to strings (for logging).

[rgbkrk]

Probably a more practical example, using pyspark since it launches a JVM process underneath:

I look forward to when we have a little kernel logs drawer instead. 😄

[rgbkrk]

To make it easier to discern the kernels and to not have all these kind of useless collapsers (since you can't bring it all together from separate logging "sessions"), I switched to logging with colors and alternating colors if you restart or launch a new kernel:

[lock]

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