Simplified IPC stream writer / remove finish on drop from stream writer

[jorgecarleitao]

Closes #574

Note that this is backward incompatible. To migrate:

• the stream is no longer closed on drop: call finish explicitly to close the stream.
• The writer is no longer encapsulated in a BufWriter: users need to explicitly do so (the writer may already be buffered)

[codecov]

Codecov Report

Merging #575 (35f7a20) into main (ec11db5) will increase coverage by 0.12%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #575      +/-   ##
==========================================
+ Coverage   78.89%   79.01%   +0.12%     
==========================================
  Files         395      395              
  Lines       24676    24771      +95     
==========================================
+ Hits        19467    19574     +107     
+ Misses       5209     5197      -12     

Impacted Files	Coverage Δ
src/io/ipc/write/stream.rs	67.85% <0.00%> (-5.48%)	⬇️
src/compute/substring.rs	95.28% <0.00%> (-1.98%)	⬇️
src/array/utf8/mod.rs	86.84% <0.00%> (+5.26%)	⬆️
tests/it/compute/substring.rs	96.36% <0.00%> (+6.79%)	⬆️

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