feat: rewrite skipNumber

[tdakkota]

name             old time/op    new time/op    delta
Valid/Big-12       3.98µs ± 2%    3.93µs ± 2%      ~     (p=0.151 n=10+9)
Valid/Floats-12    16.7µs ± 1%     3.2µs ± 2%   -81.06%  (p=0.000 n=9+9)

name             old speed      new speed      delta
Valid/Big-12      658MB/s ± 2%   666MB/s ± 3%      ~     (p=0.156 n=10+9)
Valid/Floats-12   134MB/s ± 0%   706MB/s ± 2%  +428.11%  (p=0.000 n=9+9)

name             old alloc/op   new alloc/op   delta
Valid/Big-12        0.00B          0.00B           ~     (all equal)
Valid/Floats-12    2.39kB ± 0%    0.00kB       -100.00%  (p=0.000 n=10+10)

name             old allocs/op  new allocs/op  delta
Valid/Big-12         0.00           0.00           ~     (all equal)
Valid/Floats-12       100 ± 0%         0       -100.00%  (p=0.000 n=10+10)

Fix #8

[codecov]

Codecov Report

Merging #12 (29e97c5) into main (4b65b2d) will decrease coverage by 0.24%.
The diff coverage is 97.01%.

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   99.89%   99.65%   -0.25%     
==========================================
  Files          29       29              
  Lines        1916     2011      +95     
==========================================
+ Hits         1914     2004      +90     
- Misses          2        6       +4     
- Partials        0        1       +1     

Impacted Files	Coverage Δ
dec_skip.go	98.29% <96.94%> (-1.71%)	⬇️
dec_str.go	100.00% <100.00%> (ø)
dec_float.go	98.89% <0.00%> (-1.11%)	⬇️
dec_b64.go	100.00% <0.00%> (ø)
w.go	100.00% <0.00%> (+4.44%)	⬆️

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