Add new Jupyter kernel supervisor #941

Job	Run time
Lint	1m 45s
Test Minimum Positron IPyKernel Dependencies (ubuntu-latest, 3.8)	3m 58s
Check Python types	2m 54s
Test Positron IPyKernel (ubuntu-latest, 3.8)	3m 2s
Python Tests (ubuntu-latest, 3.8)	1m 32s
Test TypeScript (ubuntu-latest, 3.x, ts-unit)	3m 39s
Test Positron IPyKernel (macos-13, 3.9)	3m 16s
Python Tests (ubuntu-latest, 3.12)	1m 36s
Test TypeScript (ubuntu-latest, 3.x, functional)	2m 8s
Test Positron IPyKernel (windows-latest, 3.10)	5m 40s
Test Positron IPyKernel (ubuntu-latest, 3.11)	3m 5s
Test TypeScript (macos-12, 3.x, ts-unit)	5m 55s
Test TypeScript (macos-12, 3.x, venv)	7m 15s
Test Positron IPyKernel (ubuntu-latest, 3.12)	1m 42s
Test TypeScript (macos-12, 3.x, single-workspace)	6m 26s
Test TypeScript (macos-12, 3.x, debugger)	5m 1s
Test TypeScript (macos-12, 3.x, functional)	3m 23s
Test TypeScript (macos-12, 3.x, smoke)	5m 19s
Test TypeScript (windows-latest, 3.x, ts-unit)	11m 38s
Test TypeScript (windows-latest, 3.x, functional)	11m 11s
	1h 30m 25s

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