Add metadata to resources

[hahn-kev]

Right now our RemoteResources only track the remoteId of the file in question.

harmony/src/SIL.Harmony/Resource/RemoteResource.cs

Lines 8 to 34 in 5a660d1

	public class RemoteResource: IObjectBase<RemoteResource>
	{
	public Guid Id { get; init; }
	public DateTimeOffset? DeletedAt { get; set; }
	/// <summary>
	/// will be null when the resource has not been uploaded yet
	/// </summary>
	public string? RemoteId { get; set; }
	public Guid[] GetReferences()
	{
	return [];
	}
	public void RemoveReference(Guid id, CommitBase commit)
	{
	}
	public IObjectBase Copy()
	{
	return new RemoteResource
	{
	Id = Id,
	RemoteId = RemoteId,
	DeletedAt = DeletedAt
	};
	}
	}

we would like to track metadata aswell, this could include stuff like author, copyright etc. For storing the data I think it should be unopinionated and just store a blob of json. We should use either a JsonDocument or JsonNode, I'm not sure which would be ideal, you can read about it here. https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/use-dom#json-dom-choices
Note that JsonDocument is IDisposable and would need to be disposed when done, that may not be possible to manage.