Update the `iceberg_scan` internals to make use of the MultiFileReader API #164

Job	Run time
Build extension binaries / Generate matrix	5s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	26m 21s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	9m 28s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	2m 8s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	8m 45s
Build extension binaries / DuckDB-Wasm	0s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	2m 44s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	10m 42s
Build extension binaries / Linux (linux_amd64_musl, alpine:3, x64-linux)	9m 35s
Deploy extension binaries / Generate matrix	2s
Deploy extension binaries / Deploy (linux_amd64)	33s
Deploy extension binaries / Deploy (linux_amd64_gcc4)	35s
Deploy extension binaries / Deploy (linux_arm64)	35s
Deploy extension binaries / Deploy (linux_amd64_musl)	37s
Deploy extension binaries / Deploy (osx_amd64)	36s
Deploy extension binaries / Deploy (osx_arm64)	37s
Deploy extension binaries / Deploy (windows_amd64)	32s
	1h 13m 55s

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