Merge pull request #26 from MaterializeInc/clonable-threaded-producer… #47

Job	Run time
check-minimal-versions	1m 49s
check (macos-11.0)	1s
lint	12s
check (windows-2019, cmake-build,libz-static,curl-static, cmake-build,libz-static,curl-static)	2m 12s
test (5.3.1, 2.3)	2m 18s
check (ubuntu-20.04, tracing)	2m 8s
test (5.0.3, 2)	2m 39s
check (ubuntu-20.04, cmake-build,ssl-vendored,gssapi-vendored,libz-static,curl-static,zstd, cmake...	2m 23s
test (4.1.3, 1.1)	2m 16s
	15m 58s

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