feat: unroll string decoder

[tdakkota]

name                              old time/op    new time/op    delta
Decoder_StrBytes/Plain/2b-4         15.4ns ± 1%    15.9ns ± 5%    +3.07%  (p=0.000 n=14+14)
Decoder_StrBytes/Plain/8b-4         22.3ns ± 1%    17.1ns ± 1%   -23.41%  (p=0.000 n=15+13)
Decoder_StrBytes/Plain/16b-4        31.5ns ± 1%    20.1ns ± 1%   -36.19%  (p=0.000 n=15+15)
Decoder_StrBytes/Plain/64b-4        95.9ns ± 1%    39.2ns ± 1%   -59.14%  (p=0.000 n=15+15)
Decoder_StrBytes/Plain/128b-4        170ns ± 1%      65ns ± 1%   -61.67%  (p=0.000 n=15+14)
Decoder_StrBytes/Plain/1024b-4      1.20µs ± 1%    0.43µs ± 2%   -63.99%  (p=0.000 n=13+15)
Decoder_StrBytes/Escaped/2b-4       17.7ns ± 1%    17.4ns ± 1%    -1.88%  (p=0.000 n=15+14)
Decoder_StrBytes/Escaped/8b-4       31.6ns ± 1%    20.0ns ± 1%   -36.51%  (p=0.000 n=14+14)
Decoder_StrBytes/Escaped/16b-4      49.9ns ± 0%    26.6ns ± 2%   -46.73%  (p=0.000 n=12+13)
Decoder_StrBytes/Escaped/64b-4       169ns ± 0%      65ns ± 2%   -61.45%  (p=0.000 n=14+13)
Decoder_StrBytes/Escaped/128b-4      317ns ± 0%     122ns ± 2%   -61.47%  (p=0.000 n=14+13)
Decoder_StrBytes/Escaped/1024b-4    2.38µs ± 1%    0.85µs ± 2%   -64.35%  (p=0.000 n=14+15)

name                              old speed      new speed      delta
Decoder_StrBytes/Plain/2b-4        259MB/s ± 1%   252MB/s ± 5%    -2.94%  (p=0.000 n=14+14)
Decoder_StrBytes/Plain/8b-4        448MB/s ± 1%   585MB/s ± 1%   +30.57%  (p=0.000 n=15+13)
Decoder_StrBytes/Plain/16b-4       571MB/s ± 1%   894MB/s ± 1%   +56.72%  (p=0.000 n=15+15)
Decoder_StrBytes/Plain/64b-4       688MB/s ± 1%  1685MB/s ± 1%  +144.71%  (p=0.000 n=15+15)
Decoder_StrBytes/Plain/128b-4      767MB/s ± 1%  2000MB/s ± 1%  +160.90%  (p=0.000 n=15+14)
Decoder_StrBytes/Plain/1024b-4     853MB/s ± 1%  2368MB/s ± 2%  +177.68%  (p=0.000 n=13+15)
Decoder_StrBytes/Escaped/2b-4      339MB/s ± 1%   345MB/s ± 1%    +1.91%  (p=0.000 n=15+14)
Decoder_StrBytes/Escaped/8b-4      570MB/s ± 1%   898MB/s ± 1%   +57.50%  (p=0.000 n=14+14)
Decoder_StrBytes/Escaped/16b-4     681MB/s ± 0%  1279MB/s ± 2%   +87.76%  (p=0.000 n=12+13)
Decoder_StrBytes/Escaped/64b-4     768MB/s ± 0%  1992MB/s ± 2%  +159.42%  (p=0.000 n=14+13)
Decoder_StrBytes/Escaped/128b-4    815MB/s ± 0%  2114MB/s ± 2%  +159.54%  (p=0.000 n=14+13)
Decoder_StrBytes/Escaped/1024b-4   861MB/s ± 1%  2414MB/s ± 2%  +180.53%  (p=0.000 n=14+15)

name                  old time/op    new time/op    delta
OTEL_Decode/Decode-4    1.25µs ± 2%    1.10µs ± 1%  -12.24%  (p=0.000 n=14+15)

name                  old speed      new speed      delta
OTEL_Decode/Decode-4   414MB/s ± 2%   472MB/s ± 1%  +13.95%  (p=0.000 n=14+15)

[codecov]

Codecov Report

Merging #23 (ff01633) into main (dcb5603) will decrease coverage by 0.06%.
The diff coverage is 97.05%.

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   99.11%   99.04%   -0.07%     
==========================================
  Files          29       29              
  Lines        2158     2210      +52     
==========================================
+ Hits         2139     2189      +50     
- Misses         15       17       +2     
  Partials        4        4              

Impacted Files	Coverage Δ
dec_str.go	99.04% <97.05%> (-0.96%)	⬇️

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