Add Apache Arrow data support

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see: https://arrow.apache.org/docs/js/

notebook stdout wiring in #29

and arrow data loading TS test notebook from #28

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looks like output data array is truncated:

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tried it again in the latest v1.59.0 insiders version. same results. bytes data array is chopped off:

vscode v. info:

Version: 1.59.0-insider (user setup)
Commit: 04485223ebc6a075f39966bf9b3e261359ac7818
Date: 2021-07-23T19:21:12.120Z
Electron: 13.1.7
Chrome: 91.0.4472.124
Node.js: 14.16.0
V8: 9.1.269.36-electron.0

data loading code and debug log:

code changes: f8d60f3