Add PRQL extension #77

Job	Run time
prepare	7s
build / Generate matrix	24s
build / Windows (windows_amd64, x64-windows-static-md)	19m 42s
build / Windows (windows_amd64_rtools, x64-mingw-static)	19m 55s
build / MacOS (osx_amd64, x86_64, x64-osx)	1m 8s
build / Linux (linux_amd64, ubuntu:18.04, x64-linux)	1m 38s
build / MacOS (osx_arm64, arm64, arm64-osx)	1m 17s
build / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	1m 5s
build / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	1m 33s
build / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	1m 37s
build / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	1m 6s
build / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	1m 8s
deploy	0s
	50m 40s

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