Reduce amount of cmake log from building & downloading libArrow

[Wumpf]

What

Before: unspeakable amount of log
Now: (windows):

  1>Creating directories for 'arrow_cpp'
  Performing download step (git clone) for 'arrow_cpp'
  Cloning into 'arrow_cpp'...
  HEAD is now at a6eabc2b MINOR: [Release] Update versions for 10.0.1
  Submodule 'cpp/submodules/parquet-testing' (https://github.com/apache/parquet-testing.git) registered for path 'cpp/submodules/parquet-testing'
  Submodule 'testing' (https://github.com/apache/arrow-testing) registered for path 'testing'
  Cloning into 'C:/dev/rerun-io/rerun/build/arrow/src/arrow_cpp/cpp/submodules/parquet-testing'...
  Cloning into 'C:/dev/rerun-io/rerun/build/arrow/src/arrow_cpp/testing'...
  Submodule path 'cpp/submodules/parquet-testing': checked out 'e13af117de7c4f0a4d9908ae3827b3ab119868f3'
  Submodule path 'testing': checked out '00c483283433b4c02cb811f260dbe35414c806a4'
  Building Custom Rule C:/dev/rerun-io/rerun/rerun_cpp/CMakeLists.txt
  Performing update step for 'arrow_cpp'
  No patch step for 'arrow_cpp'
  Performing configure step for 'arrow_cpp'
  -- arrow_cpp configure command succeeded.  See also C:/dev/rerun-io/rerun/build/arrow/src/arrow_cpp-stamp/arrow_cpp-configure-*.log
  Performing build step for 'arrow_cpp'
  -- arrow_cpp build command succeeded.  See also C:/dev/rerun-io/rerun/build/arrow/src/arrow_cpp-stamp/arrow_cpp-build-*.log
  Performing install step for 'arrow_cpp'
  -- arrow_cpp install command succeeded.  See also C:/dev/rerun-io/rerun/build/arrow/src/arrow_cpp-stamp/arrow_cpp-install-*.log
  Completed 'arrow_cpp'

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
• I've included a screenshot or gif (if applicable)
• I have tested demo.rerun.io (if applicable)
• The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG

• PR Build Summary
• Docs preview
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• Recent benchmark results
• Wasm size tracking

[emilk]

Awesome - this is a big improvement