Is your feature request related to a problem or challenge?

We have been running out of diskspace when running CI jobs

For example

• CI Rust / cargo examples (amd64) (pull_request) failing on branch-50 #18135
• Running tests uses 50.1GB of disk space on Ubuntu #11105 from @samuelcolvin

Part of this is due to the fact that each binary that is created (example, test, etc) gets an entire
copy of the DataFusion codebase compiled into it.

For example, on my machine, after running ./ci/scripts/rust_example.sh each example binary is 50-60MB in size:

(venv) andrewlamb@Andrews-MacBook-Pro-3:~/Software/datafusion$ du -s -h  target/ci/examples/
 52M	target/ci/examples/tracing
 52M	target/ci/examples/simple_udf
 55M	target/ci/examples/thread_pools

Describe the solution you'd like

Thus I think it will be helpful to reduce the number of examples

Describe alternatives you've considered

Two options, depending on the example:

1. consolidate multiple examples into a single binary with subcommands
2. Move some of the sort examples into the rustdocs closer to the code they are demonstrating

Tasks

• Update rust_example.sh to run the examples in the new format #18512
• Use strum in the examples (#19126) #19205