bench: Document how to use cross platform Samply profiler

[comphead]

Which issue does this PR close?

• Closes #.

Rationale for this change

Introduce cross platform Samply profiler for DataFusion and benchmarks

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

[parthchandra]

There is also some profiling information in https://datafusion.apache.org/comet/contributor-guide/profiling_native_code.html
I'm presuming this will replace that?
How does samply compare with cargo flamegraph ?

[comphead]

There is also some profiling information in https://datafusion.apache.org/comet/contributor-guide/profiling_native_code.html I'm presuming this will replace that? How does samply compare with cargo flamegraph ?

the tool also builds a flame graph, it can be found in the separate tab.
For the Comet I think we can refer to this section to provide alternative profiling ways

[alamb]

This is great @comphead -- I tried the instructions and it is awesome

[alamb]

Suggested change

	## Cross Platform
	## Profiling using Samply

[alamb]

Perhaps you want to change this to

Suggested change

	samply record ./target/debug/tpch benchmark datafusion --iterations 5 --path datafusion/benchmarks/data/tpch_sf10 --prefer_hash_join true --format parquet -o datafusion/benchmarks/results/dev2/tpch_sf10.json --query 22
	samply record ./target/profiling/tpch benchmark datafusion --iterations 5 --path datafusion/benchmarks/data/tpch_sf10 --prefer_hash_join true --format parquet -o datafusion/benchmarks/results/dev2/tpch_sf10.json --query 22

[comphead]

That is awesome catch