add NextPart benchmark

[mazrean]

Added benchmark when using NextPart of standard library.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.16%. Comparing base (0b5ca3b) to head (ac143d5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   70.55%   72.16%   +1.61%     
==========================================
  Files           8        8              
  Lines         309      309              
==========================================
+ Hits          218      223       +5     
+ Misses         69       65       -4     
+ Partials       22       21       -1     

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[github-actions]

Benchmark Result

goos: linux
goarch: amd64
pkg: github.com/mazrean/formstream
cpu: AMD EPYC 7763 64-Core Processor                
BenchmarkFormStreamFastPath/1MB-4 	    2788	    412625 ns/op	   10013 B/op	      64 allocs/op
BenchmarkFormStreamFastPath/10MB-4         	     304	   3908311 ns/op	   10029 B/op	      64 allocs/op
BenchmarkFormStreamFastPath/100MB-4        	      27	  41888536 ns/op	   10619 B/op	      64 allocs/op
BenchmarkFormStreamFastPath/1GB-4          	       3	 428021469 ns/op	   12906 B/op	      65 allocs/op
BenchmarkFormStreamSlowPath/1MB-4          	    2680	    444808 ns/op	   11695 B/op	      69 allocs/op
BenchmarkFormStreamSlowPath/10MB-4         	     277	   4256763 ns/op	  131280 B/op	      69 allocs/op
BenchmarkFormStreamSlowPath/100MB-4        	       5	 225715105 ns/op	26893300 B/op	      80 allocs/op
BenchmarkFormStreamSlowPath/1GB-4          	       1	2374844392 ns/op	134269624 B/op	     100 allocs/op
BenchmarkStdMultipartNextPart/1MB-4        	    2335	    430608 ns/op	   39338 B/op	      32 allocs/op
BenchmarkStdMultipartNextPart/10MB-4       	     306	   3925433 ns/op	   39316 B/op	      32 allocs/op
BenchmarkStdMultipartNextPart/100MB-4      	      27	  41961289 ns/op	   39617 B/op	      32 allocs/op
BenchmarkStdMultipartNextPart/1GB-4        	       3	 439020506 ns/op	   42202 B/op	      33 allocs/op
BenchmarkStdMultipartReadForm/1MB-4        	    1279	    825178 ns/op	 4203413 B/op	      61 allocs/op
BenchmarkStdMultipartReadForm/10MB-4       	     132	   8970577 ns/op	33566620 B/op	      64 allocs/op
BenchmarkStdMultipartReadForm/100MB-4      	       5	 242932590 ns/op	134268708 B/op	      76 allocs/op
BenchmarkStdMultipartReadForm/1GB-4        	       1	2563442948 ns/op	134275368 B/op	      77 allocs/op
PASS
ok  	github.com/mazrean/formstream	32.345s

pprof command

gh api /repos/mazrean/formstream/actions/artifacts/1371249526/zip > /tmp/profile.zip
unzip /tmp/profile.zip -d profile
rm -rf /tmp/profile.zip
go tool pprof -http :6060 profile/cpu.out