Add support for reading/writing `.xlsx` files #28

Job	Run time
Build extension binaries / Generate matrix	8s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	15m 23s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	11m 18s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	15m 38s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	4m 18s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	9m 9s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	23m 17s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	18m 4s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	5m 15s
Build extension binaries / Windows (windows_amd64_rtools, x64-mingw-static)	43m 27s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	4m 16s
Deploy extension binaries / Generate matrix	3s
Deploy extension binaries / Deploy (linux_amd64)	32s
Deploy extension binaries / Deploy (linux_amd64_gcc4)	35s
Deploy extension binaries / Deploy (linux_arm64)	30s
Deploy extension binaries / Deploy (osx_amd64)	29s
Deploy extension binaries / Deploy (osx_arm64)	35s
Deploy extension binaries / Deploy (windows_amd64)	30s
Deploy extension binaries / Deploy (windows_amd64_rtools)	35s
Deploy extension binaries / Deploy (wasm_mvp)	30s
Deploy extension binaries / Deploy (wasm_eh)	32s
Deploy extension binaries / Deploy (wasm_threads)	38s
	2h 35m 42s

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