Add support for reading/writing `.xlsx` files #29

Job	Run time
Build extension binaries / Generate matrix	3s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	3m 1s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	4m 7s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	5m 17s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	3m 42s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	22m 10s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	3m 45s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	3m 55s
Build extension binaries / Windows (windows_amd64_rtools, x64-mingw-static)	48m 57s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	5m 29s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	2m 28s
Deploy extension binaries / Generate matrix	5s
Deploy extension binaries / Deploy (linux_amd64)	28s
Deploy extension binaries / Deploy (linux_amd64_gcc4)	31s
Deploy extension binaries / Deploy (linux_arm64)	35s
Deploy extension binaries / Deploy (osx_amd64)	31s
Deploy extension binaries / Deploy (osx_arm64)	41s
Deploy extension binaries / Deploy (windows_amd64)	35s
Deploy extension binaries / Deploy (windows_amd64_rtools)	32s
Deploy extension binaries / Deploy (wasm_mvp)	31s
Deploy extension binaries / Deploy (wasm_eh)	30s
Deploy extension binaries / Deploy (wasm_threads)	40s
	1h 48m 33s

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