Benchmark parse function

[blakeembrey]

Add a benchmark utility, remove user:pass regex in favor of simple indexOf. Somewhat faster.

Before:

     name                                                hz     min     max    mean     p75     p99    p995    p999     rme  samples
   · basic auth header                         2,051,649.51  0.0003  1.5729  0.0005  0.0004  0.0012  0.0014  0.0141  ±1.34%  1025825
   · basic auth header with extra whitespace   2,353,509.46  0.0003  0.2861  0.0004  0.0004  0.0005  0.0006  0.0016  ±0.32%  1176755
   · invalid basic auth header                 2,470,888.19  0.0002  0.4685  0.0004  0.0004  0.0005  0.0011  0.0025  ±0.63%  1235445
   · non-basic auth header                    17,442,921.02  0.0000  0.4710  0.0001  0.0001  0.0001  0.0001  0.0002  ±0.34%  8721461

After:

 ✓ src/parse.bench.ts > parse 6339ms
     name                                                hz     min     max    mean     p75     p99    p995    p999     rme  samples
   · basic auth header                         2,386,295.98  0.0003  0.6112  0.0004  0.0004  0.0011  0.0011  0.0021  ±0.64%  1193148
   · basic auth header with extra whitespace   2,426,362.48  0.0003  0.3008  0.0004  0.0004  0.0005  0.0005  0.0011  ±0.30%  1213182
   · invalid basic auth header                 2,667,422.31  0.0002  0.2500  0.0004  0.0004  0.0005  0.0005  0.0010  ±0.27%  1333712
   · non-basic auth header                    16,981,965.93  0.0000  2.4181  0.0001  0.0001  0.0001  0.0001  0.0002  ±0.97%  8490983

I also made an attempt with a parser similar to cookie, content-type, etc but the perf gains vs complexity/code overhead doesn't seem to be worth it, the indexOf is pretty small in comparison.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ee70132) to head (a6089af).

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #96   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           48        47    -1     
  Branches        21        19    -2     
=========================================
- Hits            48        47    -1     

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