Change the code to use msgp. Add benchmarks.

[schmidtw]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 148 lines in your changes missing coverage. Please review.

Project coverage is 85.02%. Comparing base (5faa7fb) to head (ddbcb26).
Report is 5 commits behind head on dev_v4.

Files with missing lines	Patch %	Lines
messages_gen.go	66.83%	101 Missing and 29 partials ⚠️
format.go	64.00%	16 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           dev_v4     #223      +/-   ##
==========================================
- Coverage   91.28%   85.02%   -6.26%     
==========================================
  Files          13       14       +1     
  Lines        1262     1683     +421     
==========================================
+ Hits         1152     1431     +279     
- Misses         93      205     +112     
- Partials       17       47      +30     

Flag	Coverage Δ
unittests	85.02% <66.66%> (-6.26%)	⬇️

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