WIP merge `xeus-python-kernel` #310

Job	Run time
test-unix (ubuntu-20.04, static_build)	1m 20s
test-wasm (3.1.45)	10m 7s
test-win (windows-2019, static_build)	2m 50s
test-win (windows-2019, shared_build)	4m 26s
test-unix (ubuntu-20.04, shared_build)	1m 19s
test-win (windows-2022, static_build)	3m 17s
test-win (windows-2022, shared_build)	4m 59s
test-unix (ubuntu-22.04, static_build)	1m 18s
test-unix (ubuntu-22.04, shared_build)	2m 46s
test-unix (macos-11, static_build)	4m 1s
test-unix (macos-11, shared_build)	4m 11s
test-unix (macos-12, static_build)	3m 0s
test-unix (macos-12, shared_build)	2m 32s
	46m 6s

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