feat: Add OpenSans font manifest

[Youssef1313]

GitHub Issue (If applicable): #

PR Type

What kind of change does this PR introduce?

What is the current behavior?

What is the new behavior?

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Updated the Release Notes
• Associated with an issue (GitHub or internal)

Other information

Code used to generate manifest:

using System.Text.Json;
using System.Text.Json.Serialization;

var options = new JsonSerializerOptions()
{
    AllowTrailingCommas = true,
    PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
    ReadCommentHandling = JsonCommentHandling.Skip,
    Converters =
    {
        new JsonStringEnumConverter(),
    },
};

var directory = "C:\\Users\\PC\\Desktop\\uno.fonts\\nuget\\OpenSans\\Uno.Fonts.OpenSans\\Fonts\\";

var list = new List<FontInfo>();

foreach (var stretch in Enum.GetValues<FontStretch>())
{
    foreach (ushort weight in (ReadOnlySpan<ushort>)[300, 400, 500, 600, 700, 800])
    {
        foreach (var style in (ReadOnlySpan<FontStyle>)[FontStyle.Normal, FontStyle.Italic])
        {
            var name = "OpenSans";
            if (stretch != FontStretch.Normal)
            {
                name += "_" + stretch.ToString();
            }

            if (weight != 400 || style != FontStyle.Normal)
            {
                name += "-";
                if (weight != 400)
                {
                    name += WeightToName(weight);
                }

                if (style != FontStyle.Normal)
                {
                    name += style.ToString();
                }
            }
            else
            {
                name += "-Regular";
            }

            name += ".ttf";

            if (File.Exists(directory + name))
            {
                list.Add(new FontInfo
                {
                    FontWeight = weight,
                    FontStyle = style,
                    FontStretch = stretch,
                    FamilyName = "ms-appx:///Uno.Fonts.OpenSans/Fonts/" + name,
                });
            }
        }
    }
}

var manifest = new FontManifest
{
    Fonts = list.ToArray(),
};

var json = JsonSerializer.Serialize<FontManifest>(manifest, options);

Console.WriteLine(json);

string WeightToName(ushort weight)
{
    return weight switch
    {
        300 => "Light",
        500 => "Medium",
        600 => "SemiBold",
        700 => "Bold",
        800 => "ExtraBold",
        _ => throw new Exception()
    };
}

internal sealed class FontManifest
{
    public FontInfo[] Fonts { get; set; }
}

internal sealed class FontInfo
{
    public FontStyle FontStyle { get; set; }
    public ushort FontWeight { get; set; }
    public FontStretch FontStretch { get; set; }
    public string FamilyName { get; set; }
}

public enum FontStyle
{
    Normal,
    Oblique,
    Italic,
}
public enum FontStretch
{
    Undefined = 0,
    UltraCondensed = 1,
    ExtraCondensed = 2,
    Condensed = 3,
    SemiCondensed = 4,
    Normal = 5,
    SemiExpanded = 6,
    Expanded = 7,
    ExtraExpanded = 8,
    UltraExpanded = 9,
}

Internal Issue (If applicable):

[MartinZikmund]

@agneszitte When you are on-line, please merge this one 🙏