Support Bytes mapping to Binary in ToSchema

[Fokko]

What changes are proposed in this pull request?

ByteBuf is a small wrapper that makes handling bytes more efficient:

https://docs.rs/serde_bytes/latest/serde_bytes/struct.ByteBuf.html

How was this change tested?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.90%. Comparing base (82fa82e) to head (19dfbf9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1361      +/-   ##
==========================================
+ Coverage   84.89%   84.90%   +0.01%     
==========================================
  Files         113      113              
  Lines       28923    28923              
  Branches    28923    28923              
==========================================
+ Hits        24553    24556       +3     
+ Misses       3198     3197       -1     
+ Partials     1172     1170       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[zachschuermann]

do we have a use case for this yet? should we perhaps consider using just normal Vec or Bytes before optimizing? Or do we already know this optimization has utility?

[Fokko]

Great question. Vec<u8> does not translate well, since that will be turned into an ArrayType:

delta-kernel-rs/kernel/src/schema/derive_macro_utils.rs

Lines 48 to 53 in 82fa82e

	// ToDataType impl for non-nullable array types
	impl<T: ToDataType> ToDataType for Vec<T> {
	fn to_data_type() -> DataType {
	ArrayType::new(T::to_data_type(), false).into()
	}
	}

After looking a bit more into it, I think Bytes will also work. The bytes will mostly contain DVs that we need to slice out.