Add raster type & functions to manage rasters in the spatial extension #94

Job	Run time
Build extension binaries / Generate matrix	32s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	50m 12s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	6m 8s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	50m 0s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	36m 6s
Build extension binaries / Windows (windows_amd64_rtools, x64-mingw-static)	5m 56s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	21m 31s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	36m 22s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	21m 16s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	36m 49s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	21m 30s
Deploy extension binaries	0s
	4h 46m 22s

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