🐛 Inject IMudMarkdownMemoryCache into MudMarkdownValueProvider

[MattParkerDev]

Fixes #311

Tests pass, I haven't tested any further than that.

[MihailsKuzmins]

@MattParkerDev thanks. It looks like bUnit also registers an IMemoryCache, therefore, unit tests have not been able to catch this error and IMemoryCache was successfully injected into MudMarkdownValueProvider.

Therefore, could you please add a new unit test to prevent this error from happening in MudBlazor.Markdown.Tests?
Utils/ServiceCollectionExTests/AddMudMarkdownServicesShould.cs
※ please use tabs for indentation.

namespace MudBlazor.Markdown.Tests.Utils.ServiceCollectionExTests;

public sealed class AddMudMarkdownServicesShould
{
	[Fact]
	public void RegisterServices()
	{
		using var serviceProvider = new ServiceCollection()
			.AddMudMarkdownServices()
			.BuildServiceProvider();

		serviceProvider.GetRequiredService<IMudMarkdownMemoryCache>()
			.Should()
			.BeOfType<MudMarkdownMemoryCache>();

		serviceProvider.GetService<IMemoryCache>()
			.Should()
			.BeNull();

		serviceProvider.GetRequiredService<IMudMarkdownThemeService>()
			.Should()
			.BeOfType<MudMarkdownThemeService>();

		serviceProvider.GetRequiredService<IMudMarkdownValueProvider>()
			.Should()
			.BeOfType<MudMarkdownValueProvider>();
	}
}

[MattParkerDev]

@MihailsKuzmins test added :)