feat(buffer): make the cache size of buffers configurable

[Viatorus]

No description provided.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (a583ffa) 99.40% compared to head (5e2a498) 99.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #64   +/-   ##
=======================================
  Coverage   99.40%   99.40%           
=======================================
  Files          56       56           
  Lines        5866     5866           
=======================================
  Hits         5831     5831           
  Misses         35       35           

Files	Coverage Δ
include/emio/buffer.hpp	99.35% <100.00%> (ø)
test/unit_test/test_buffer.cpp	100.00% <100.00%> (ø)
test/unit_test/test_writer.cpp	100.00% <100.00%> (ø)

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