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Sebastien Binet
b16b88b8fbf
Sebastien Binet authored cc0a9cb620a
ARROW-4735: [Go] Optimize CSV writer CPU/Mem performances

This CL replaces all the naive calls to fmt.Sprintf with
strconv.FormatXYZ.

```
$> benchstat old.txt new.txt
name     old time/op    new time/op    delta
Write-4    2.21ms ±12%    1.15ms ± 1%  -47.78%  (p=0.000 n=30+30)

name     old alloc/op   new alloc/op   delta
Write-4     335kB ± 0%     308kB ± 0%   -8.21%  (p=0.000 n=30+29)

name     old allocs/op  new allocs/op  delta
Write-4     21.8k ± 0%     11.6k ± 0%  -46.96%  (p=0.000 n=30+30)
```

Author: Sebastien Binet <binet@cern.ch>

Closes #3879 from sbinet/issue-4735 and squashes the following commits:

48f53222 <Sebastien Binet> go/arrow/csv: fix record index display
26665af2 <Sebastien Binet> ARROW-4735:  Optimize CSV writer CPU/Mem performances