build and test VS Code extension

Improve installation section in README #6359

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Run time

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Job	Run time
build macOS x86_64	58s
build macOS AArch64	1m 46s
build Linux x86_64	51s
build Linux ARM	4m 28s
build Linux AArch64	1m 23s
build Windows x86	3m 11s
build Windows x64	2m 29s
build Windows ARM	1m 23s
build Windows ARM64	1m 21s
VS Code .vsix	17s
test macOS x86_64	1m 0s
test macOS AArch64	33s
test Linux x86_64	26s
test Windows x86	1m 19s
test Windows x64	57s
	22m 22s