Using the new and more precice TimeProvider for ProgressTask instead of DateTime

[FaustVX]

fixes #1949

• I have read the Contribution Guidelines
• I have commented on the issue above and discussed the intended changes
• A maintainer has signed off on the changes and the issue was assigned to me
• All newly added code is adequately covered by tests
• All existing tests are still running without errors
• The documentation was modified to reflect the changes OR no documentation changes are required.

Changes

I've changed the ProgressTask.StartTime & ProgressTask.StopTime properties to long? then use the new API from .NET8: TimeProvider.System.GetTimestamp() & TimeProvider.System.GetElapsedTime()

I've also added Microsoft.Bcl.TimeProvider package for netstandard2.0 because TimeProvider is only available from net8.0

await AnsiConsole.Progress()
    .Columns([
        new TaskDescriptionColumn(),
        new ProgressBarColumn(),
        new ElapsedTimeColumn() { Format = null }, // change the new Format property
    ]).StartAsync(...);

ElepsedTimeColumn.cs & RemainingTimeColumn.cs

public string? Format { get; set; } = @"hh\:mm\:ss";

public override IRenderable Render(RenderOptions options, ProgressTask task, TimeSpan deltaTime)
{
    // ...
    return new Text($"{elapsed.Value.ToString(Format)}", Style ?? Style.Plain);
}

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[FaustVX]

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