Add legate-issue command for collecting issue info (#863) #640

Job	Run time
build-gpu / build-gpu-sub-workflow	9m 26s
Pytest Unit Tests / test-gpu-sub-workflow	2m 30s
Pytest Unit Tests / test-gpu-sub-workflow	1m 1s
mypy / test-gpu-sub-workflow	2m 23s
cleanup / cleanup	2s
	15m 22s

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