[I] [Go] Date32 and Date64 String() methods return numbers instead of dates [arrow-go]

["hermanschaaf (via GitHub)" <gi...@apache.org>]

hermanschaaf opened a new issue, #63:
URL: https://github.com/apache/arrow-go/issues/63

   ### Describe the bug, including details regarding any error messages, version, and platform.
   
   The String methods on the Go `array.Date32` and `array.Date64` types return strings formatted as the underlying integers, rather than strings formatted as dates as in other implementations.
   
   For example, this code in Go:
   
   ```
   package main
   
   import (
   	"fmt"
   
   	"github.com/apache/arrow/go/v12/arrow"
   	"github.com/apache/arrow/go/v12/arrow/array"
   	"github.com/apache/arrow/go/v12/arrow/memory"
   )
   
   func main() {
   	db := array.NewDate32Builder(memory.DefaultAllocator)
   	defer db.Release()
   	db.AppendValues([]arrow.Date32{1, 2, 3}, nil)
   	arr := db.NewArray()
   	defer arr.Release()
   	fmt.Println(arr)
   }
   ```
   
   produces the following output:
   
   ```
   [1 2 3]
   ```
   
   More or less equivalent code in Python:
   
   ```
   import pyarrow as pa
   
   date_array = pa.array([1, 2, 3], type=pa.date32())
   print(date_array)
   ```
   
   produces:
   
   ```
   [
     1970-01-02,
     1970-01-03,
     1970-01-04
   ]
   ```
   
   I think the Go implementation's dates should also return formatted dates?
   
   ### Component(s)
   
   Go


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