Add JUnit formatter #74

Job	Run time
build-and-test (native, ubuntu-latest)	47s
build-and-test (llvm, macos-13)	2m 22s
build-and-test (native, macos-15)	43s
build-and-test (native, windows-latest)	2m 22s
build-and-test (native, macos-13)	28s
build-and-test (gcc, macos-13)	1m 21s
build-and-test (llvm, ubuntu-latest)	49s
build-and-test (gcc, windows-latest)	2m 6s
build-and-test (llvm, macos-15)	43s
build-and-test (gcc, macos-15)	42s
Publish Tests Results	13s
	12m 36s

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