std::span/std::string_view for base64 codec

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Codecov Report

Patch coverage: 20.00% and project coverage change: -0.04 ⚠️

Comparison is base (63434bb) 88.16% compared to head (bca7ef6) 88.13%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3350      +/-   ##
==========================================
- Coverage   88.16%   88.13%   -0.04%     
==========================================
  Files         615      615              
  Lines       69987    69994       +7     
  Branches     6949     6950       +1     
==========================================
- Hits        61702    61687      -15     
- Misses       5385     5401      +16     
- Partials     2900     2906       +6     

Impacted Files	Coverage Δ
src/lib/codec/base64/base64.cpp	92.59% <20.00%> (-4.82%)	⬇️
src/lib/utils/thread_utils/semaphore.cpp	45.45% <0.00%> (-54.55%)	⬇️
src/lib/pbkdf/argon2/argon2pwhash.cpp	69.69% <0.00%> (-9.10%)	⬇️
src/fuzzer/barrett.cpp	66.66% <0.00%> (-5.56%)	⬇️
src/fuzzer/mode_padding.cpp	90.90% <0.00%> (-3.74%)	⬇️
src/lib/pubkey/elgamal/elgamal.cpp	84.93% <0.00%> (-1.37%)	⬇️
src/lib/pubkey/dl_group/dl_group.cpp	84.78% <0.00%> (-0.68%)	⬇️
src/lib/ffi/ffi.cpp	76.15% <0.00%> (-0.67%)	⬇️
src/lib/math/numbertheory/numthry.cpp	83.90% <0.00%> (-0.49%)	⬇️
src/tests/test_bigint.cpp	90.86% <0.00%> (+0.02%)	⬆️
... and 3 more

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