fix(build): Include build.rs in published crates

[colinmarc]

This fixes a very niche build problem: depending on datafusion-python as an rlib, and then attempting to build on macOS.

Because of the presence of an 'include' configuration in Cargo.toml, everything else is excluded - as well as build.rs, which means the necessary pyo3 linker flags aren't set when building.

I verified this fixes my build issue using a git dependency on datafusion-python:

datafusion-python = { git = "https://github.com/apache/datafusion-python", tag = "48.0.0" }

Whereas just using the crates.io version doesn't build:

    error: linking with `cc` failed: exit status: 1
        |
        = note:  "cc" "-Wl,-exported_symbols_list" "-Wl,/var/folders/b5/5n9p78x14yn8z4ky6fxtdp280000gn/T/rustc7RNcRS/list"
      "/var/folders/b5/5n9p78x14yn8z4ky6fxtdp280000gn/T/rustc7RNcRS/symbols.o" "<17 object files omitted>"
      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      "<sysroot>/lib/rustlib/aarch64-apple-darwin/lib/{libstd-*,libpanic_unwind-*,libobject-*,libmemchr-*,libaddr2line-*,libgimli-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libminiz_oxide-*,libadler2-*,libunwind-*,libcfg_if-*,liblibc-*,liballoc-*,librustc_std_workspace_core-*,libcore-*,libcompiler_builtins-*}.rlib"
      "-framework" "Security" "-framework" "CoreFoundation" "-liconv" "-lSystem" "-lc" "-lm" "-arch" "arm64" "-mmacosx-version-min=11.0.0" "-L"
      "/Users/colinmarc/dev/bpln/all-events/target/release/build/bzip2-sys-ce2535ad003224bd/out/lib" "-L" "/Users/colinmarc/dev/bpln/all-events/target/release/build/lzma-sys-e3b54090af14827e/out"
      "-L" "/Users/colinmarc/dev/bpln/all-events/target/release/build/zstd-sys-89467c99fe98418d/out" "-L" "/Users/colinmarc/dev/bpln/all-events/target/release/build/ring-6c070c10dae4d85c/out"
      "-L" "/Users/colinmarc/dev/bpln/all-events/target/release/build/psm-478f69e03f9c498e/out" "-L" "/Users/colinmarc/dev/bpln/all-events/target/release/build/blake3-b9ff590313ad109f/out" "-L"
      "/Users/colinmarc/dev/bpln/all-events/target/release/build/libmimalloc-sys-b64c9c1ed3774578/out" "-o" "/Users/colinmarc/dev/bpln/all-events/target/release/deps/libdatafusion_python-62a9be6a9f738ad3.dylib"
      "-Wl,-dead_strip" "-dynamiclib" "-nodefaultlibs"
        = note: some arguments are omitted. use `--verbose` to show all linker arguments
        = note: ld: warning: object file (/Users/colinmarc/dev/bpln/all-events/target/release/deps/libblake3-b47f6144315c4d77.rlib[5](a1edd97dd51cd48d-blake3_neon.o)) was built for newer 'macOS' version (15.5)
      than being linked (11.0)
                Undefined symbols for architecture arm64:
                  "_PyBaseObject_Type", referenced from:
                      <snip>
                      ...
                ld: symbol(s) not found for architecture arm64
                clang: error: linker command failed with exit code 1 (use -v to see invocation)


      error: could not compile `datafusion-python` (lib) due to 1 previous error
      💥 maturin failed
        Caused by: Failed to build a native library through cargo
        Caused by: Cargo build finished with "exit status: 101": `env -u CARGO MACOSX_DEPLOYMENT_TARGET="11.0" PYO3_ENVIRONMENT_SIGNATURE="cpython-3.12-64bit"
      PYO3_PYTHON="/Users/colinmarc/.cache/uv/builds-v0/.tmppBVRox/bin/python" PYTHON_SYS_EXECUTABLE="/Users/colinmarc/.cache/uv/builds-v0/.tmppBVRox/bin/python" "cargo" "rustc" "--features"
      "pyo3/extension-module" "--features" "python" "--message-format" "json-render-diagnostics" "--manifest-path" "/Users/colinmarc/dev/bpln/all-events/crates/bpln-df-extensions/Cargo.toml" "--release" "--lib"
      "--crate-type" "cdylib" "--" "-C" "link-arg=-undefined" "-C" "link-arg=dynamic_lookup" "-C" "link-args=-Wl,-install_name,@rpath/bauplan_datafusion_extensions.abi3.so"`
      Error: command ['maturin', 'pep517', 'build-wheel', '-i', '/Users/colinmarc/.cache/uv/builds-v0/.tmppBVRox/bin/python', '--compatibility', 'off'] returned non-zero exit status 1

Note that you can verify build.rs is missing this way:

curl -fsSL https://crates.io/api/v1/crates/datafusion-python/48.0.0/download -o - | tar tf - | grep build.rs

[timsaucer]

Thank you for the contribution!