Add raster type & functions to manage rasters in the spatial extension #47

Job	Run time
Build extension binaries / Generate matrix	26s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	38m 1s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	38m 9s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	22m 0s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	34m 52s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	37m 20s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	23m 45s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	1m 21s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	21m 10s
Build extension binaries / Windows (windows_amd64_rtools, x64-mingw-static)	1m 26s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	39m 20s
Deploy extension binaries	0s
	4h 17m 50s

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