IDE support: add _vscode with launch.json and tasks.json #120

Job	Run time
coverity-test	0s
test-coverage	5m 18s
scanbuild	6m 41s
build-test (ubuntu-20.04, gcc)	4m 31s
build-test (ubuntu-20.04, clang)	4m 23s
test-fuzz	2m 38s
test-mbedtls (ubuntu-20.04)	2m 55s
build-test (fedora-32, gcc)	4m 48s
test-no-crypto-build	1m 28s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 42s
test-tcti-config	14m 9s
build-test (fedora-32, clang)	5m 0s
build-test (opensuse-leap, gcc)	4m 39s
build-test (opensuse-leap, clang)	4m 39s
build-test (ubuntu-22.04, gcc)	4m 38s
build-test (ubuntu-22.04, clang)	4m 34s
build-test (alpine-3.15, gcc)	4m 0s
build-test (alpine-3.15, clang)	4m 47s
	1h 21m 50s

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