Made kafka schema_id u32 in example

[jorgecarleitao]

Based on the comment by @scimas here: #1151 (comment) (thanks!)

[codecov]

Codecov Report

Merging #1162 (b1abda2) into main (6de9edf) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1162      +/-   ##
==========================================
+ Coverage   83.67%   83.71%   +0.03%     
==========================================
  Files         365      365              
  Lines       35865    36131     +266     
==========================================
+ Hits        30011    30248     +237     
- Misses       5854     5883      +29     

Impacted Files	Coverage Δ
src/io/ipc/read/array/boolean.rs	90.74% <0.00%> (-7.41%)	⬇️
src/array/binary/mod.rs	88.88% <0.00%> (-1.24%)	⬇️
src/ffi/array.rs	88.61% <0.00%> (-0.92%)	⬇️
src/io/flight/mod.rs	66.66% <0.00%> (-0.67%)	⬇️
src/io/ipc/read/common.rs	94.33% <0.00%> (-0.59%)	⬇️
src/array/utf8/mutable.rs	90.52% <0.00%> (+0.27%)	⬆️
src/io/ipc/read/schema.rs	95.06% <0.00%> (+0.49%)	⬆️
src/io/ipc/read/reader.rs	96.65% <0.00%> (+0.66%)	⬆️
src/array/utf8/mod.rs	86.58% <0.00%> (+0.95%)	⬆️
src/compute/boolean.rs	96.63% <0.00%> (+2.04%)	⬆️
... and 2 more

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