Allow submission payloads to be provided by file or standard input #711

Job	Run time
Build and Run Tests (ubuntu-latest)	1m 14s
Build CLI - win-x64	3m 1s
Build and Run Tests (macos-latest)	1m 5s
Build and Run Tests (windows-latest)	2m 18s
Build CLI - osx-arm64	1m 28s
Build CLI - linux-arm64	1m 43s
Build CLI - win-arm64	2m 29s
Build CLI - linux-x64	1m 37s
Build CLI - osx-x64	1m 25s
	16m 20s

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