Introduce Equal comparison in pcommon types

[dmathieu]

Description

This introduces .Equal() methods to most pcommon types, so equality comparison can be performed with no allocations.

The types Equal is added to are:

• Value
• ByteSlice
• Float64Slice
• Int32Slice
• Int64Slice
• StringSlice
• Uint64Slice
• Map
• Slice

The original intent was to add it to Value. However, to be able to handle every type in there, I had to also add it to the other types, some of which are coming too because they are auto-generated.

Link to tracking issue

Fixes #12561

This is the same thing as #12568, but with comparison of pcommon types rather than raw ones.

Testing

Here are the results from the new benchmarks.

goos: darwin
goarch: arm64
pkg: go.opentelemetry.io/collector/pdata/pcommon
cpu: Apple M1 Max
BenchmarkByteSliceEqual-10              513754251                2.181 ns/op           0 B/op          0 allocs/op
BenchmarkFloat64SliceEqual-10           550760200                2.189 ns/op           0 B/op          0 allocs/op
BenchmarkInt32SliceEqual-10             550836993                2.186 ns/op           0 B/op          0 allocs/op
BenchmarkInt64SliceEqual-10             536615931                2.178 ns/op           0 B/op          0 allocs/op
BenchmarkStringSliceEqual-10            166586130                7.055 ns/op           0 B/op          0 allocs/op
BenchmarkUInt64SliceEqual-10            550221884                2.191 ns/op           0 B/op          0 allocs/op
BenchmarkMapEqual-10                    100000000               10.29 ns/op            0 B/op          0 allocs/op
BenchmarkSliceEqual-10                  165937951                7.185 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/nil-10              425391500                2.817 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/strings-10          226853427                5.441 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/booleans-10         296628630                4.080 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/ints-10             296841543                4.070 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/doubles-10          296242837                4.050 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/byte_slices-10              173515455                6.855 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/slices-10                   83512392                14.10 ns/op            0 B/op          0 allocs/op
BenchmarkValueEqual/maps-10                     63556654                18.41 ns/op            0 B/op          0 allocs/op
PASS
ok      go.opentelemetry.io/collector/pdata/pcommon     24.650s

[codecov]

Codecov Report

Attention: Patch coverage is 88.33333% with 7 lines in your changes missing coverage. Please review.

Project coverage is 92.17%. Comparing base (7d3e03e) to head (20f1b34).

Files with missing lines	Patch %	Lines
pdata/pcommon/value.go	81.81%	3 Missing and 1 partial ⚠️
pdata/pcommon/map.go	82.35%	2 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (88.33%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12594      +/-   ##
==========================================
- Coverage   92.18%   92.17%   -0.01%     
==========================================
  Files         469      469              
  Lines       25394    25454      +60     
==========================================
+ Hits        23409    23462      +53     
- Misses       1574     1579       +5     
- Partials      411      413       +2     

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[bogdandrutu]

Already checked, just return true.