[C#] use SqlDecimal.WriteTdsValue for .NET 7+ to avoid allocating a byte[] array

### Describe the enhancement requested

In .NET 7+ there is an option to use [SqlDecimal.WriteTdsValue](https://learn.microsoft.com/en-us/dotnet/api/system.data.sqltypes.sqldecimal.writetdsvalue?view=net-8.0#system-data-sqltypes-sqldecimal-writetdsvalue(system-span((system-uint32)))) to avoid allocating a `byte[]`

https://github.com/apache/arrow/blob/68eeef52aa78743a69844914ec984bed053bcfff/csharp/src/Apache.Arrow/DecimalUtility.cs#L434-L436

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[C#] use SqlDecimal.WriteTdsValue for .NET 7+ to avoid allocating a byte[] array #41349

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	// TODO: Consider groveling in the internals to avoid the probable allocation
	Span<int> span = bytes.CastTo<int>();
	value.Data.AsSpan().CopyTo(span);

[C#] use SqlDecimal.WriteTdsValue for .NET 7+ to avoid allocating a byte[] array #41349

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