Support for streaming responses / SSE #927

Job	Run time
build	4m 30s
Julia 1.6 - ubuntu-latest - x64	5m 49s
Julia 1.6 - macOS-latest - x64	6m 38s
Julia 1.6 - windows-latest - x64	17m 37s
Julia 1.8 - ubuntu-latest - x64	4m 41s
Julia 1.8 - macOS-latest - x64	8m 20s
Julia 1.8 - windows-latest - x64	5m 44s
Julia 1 - ubuntu-latest - x64	3m 31s
Julia 1 - macOS-latest - x64	7m 19s
Julia 1 - windows-latest - x64	7m 7s
Julia nightly - ubuntu-latest - x64	13m 38s
Julia nightly - macOS-latest - x64	17m 56s
Julia nightly - windows-latest - x64	8m 39s
	1h 51m 29s

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