Support O DateTime(Offset) format in dotnet user-jwts tool

[martincostello]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

When using the new dotnet user-jwts tool, users may paste formatted date times in from other sources (e.g. decoding another existing JWT using something like jwt.io).

Describe the solution you'd like

To make copy-paste in these scenarios, supporting the "O" format would make the tool more user-friendly.

The tool already supports 4 different possible formats:

aspnetcore/src/Tools/dotnet-user-jwts/src/Commands/CreateCommand.cs

Line 14 in 6b2e422

"yyyy-MM-dd", "yyyy-MM-dd HH:mm", "yyyy/MM/dd", "yyyy/MM/dd HH:mm" };

It displays the values in "O" format from the list command, so would support round-tripping when decoded.

aspnetcore/src/Tools/dotnet-user-jwts/src/Commands/ListCommand.cs

Lines 55 to 62 in 6b2e422

	if (showTokens)
	{
	table.AddRow(jwt.Id, jwt.Scheme, jwt.Audience, jwt.Issued.ToString("O"), jwt.Expires.ToString("O"), jwt.Token);
	}
	else
	{
	table.AddRow(jwt.Id, jwt.Scheme, jwt.Audience, jwt.Issued.ToString("O"), jwt.Expires.ToString("O"));
	}

Additional context

See #41956 (comment).

/cc @DamianEdwards

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