perf: improve serialization performance

[ab93]

• close the buffer
• use highest pickle protocol by default
• benchmarking in unit tests

Change	Improvement
Closing buffer	3.2%
Protocol update	15.5%

[codecov]

Codecov Report

Merging #243 (81d9669) into main (7ef40a0) will decrease coverage by 0.26%.
The diff coverage is 100.00%.

❗ Current head 81d9669 differs from pull request most recent head 4306978. Consider uploading reports for the commit 4306978 to get more accurate results

@@            Coverage Diff             @@
##             main     #243      +/-   ##
==========================================
- Coverage   96.43%   96.18%   -0.26%     
==========================================
  Files          53       53              
  Lines        2219     2226       +7     
  Branches      174      174              
==========================================
+ Hits         2140     2141       +1     
- Misses         56       60       +4     
- Partials       23       25       +2     

Files Changed	Coverage Δ
numalogic/registry/_serialize.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[s0nicboOm]

LGTM!