ci: Add `windows-ci-shared` that uses `vcpkg`. #178

Job	Run time
stable, macOS, shared library	51s
stable, Linux, static linking, no pkg-config	1m 25s
stable, iOS, static library	3m 18s
stable, Linux, shared library	38s
stable, macOS, static library	1m 10s
stable, Emscripten, static library	1m 18s
stable, Windows, shared library	5m 13s
stable, Windows, static library	1m 30s
Result	0s
	15m 23s

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