Commits on Nov 12, 2024

1. Optimize counter inc-by-one …

   Conceivably increment-by-one is by far the most common operation on counters.
   This PR optimize such operation, making it alloc-free.
   
   Benchmark with:
   ```
   func BenchmarkInc(b *testing.B) {
   	b.Run("Increment", func(b *testing.B) {
   		w := writer.MemoryWriter{}
   		id := NewId("foo", nil)
   		c := NewCounter(id, &w)
   		b.ReportAllocs()
   		b.ResetTimer()
   		for i := 0; i < b.N; i++ {
   			c.Increment()
   		}
   	})
   }
   ```
   
   before optimization:
   ```
   goos: darwin
   goarch: arm64
   pkg: github.com/Netflix/spectator-go/v2/spectator/meter
   cpu: Apple M3 Pro
   BenchmarkInc/Increment-12               10298648               115.2
   ns/op           120 B/op          3 allocs/op
   PASS
   ok      github.com/Netflix/spectator-go/v2/spectator/meter      2.485s
   ```
   
   after optimization:
   ```
   goos: darwin
   goarch: arm64
   pkg: github.com/Netflix/spectator-go/v2/spectator/meter
   cpu: Apple M3 Pro
   BenchmarkInc/Increment-12               40374824                31.44
   ns/op           97 B/op          0 allocs/op
   PASS
   ok      github.com/Netflix/spectator-go/v2/spectator/meter      3.563s
   ```

   Ling Yuan committed Nov 12, 2024
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