AppendFormat based on ReadOnlySpan?

[mdsitton]

Hi I have a feature request, it would be nice to have the ability to have an implementation of AppendFormat that takes a ReadOnlySpan instead of the format string that way we can pass in data from another ZStringBuilder through span as a format string.

This is useful for building a format string based on input data coming in through a function without allocating a new string for the format string.

[mdsitton]

https://github.com/mdsitton/ZString/tree/SpanFormat I've created a quick experiment of this based off of one of the other pr's to test this out.

[neuecc]

thanks, it seems good.

[github-actions]

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