Replaced assert by error in IPC read

[jorgecarleitao]

Removed (hopefully last) assert from IPC read, thereby making IPC reading panic free.

[codecov]

Codecov Report

Merging #748 (a249de5) into main (4c29966) will decrease coverage by 0.01%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##             main     #748      +/-   ##
==========================================
- Coverage   70.82%   70.80%   -0.02%     
==========================================
  Files         313      313              
  Lines       16931    16937       +6     
==========================================
+ Hits        11992    11993       +1     
- Misses       4939     4944       +5     

Impacted Files	Coverage Δ
src/io/ipc/read/read_basic.rs	66.35% <14.28%> (-3.95%)	⬇️
src/io/avro/read/schema.rs	55.91% <0.00%> (+1.07%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4c29966...a249de5. Read the comment docs.