Add JSON text renderer (#1086)

* Add JsonText widget to render highlighted JSON

Closes #1051

test/Spectre.Console.Tests/Unit/Widgets/JsonTextTests.cs

@@ -0,0 +1,23 @@
+namespace Spectre.Console.Tests.Unit;
+
+[UsesVerify]
+[ExpectationPath("Widgets/Json")]
+public sealed class JsonTextTests
+{
+    [Fact]
+    [Expectation("Render_Json")]
+    public Task Should_Render_Json()
+    {
+        // Given
+        var console = new TestConsole().Size(new Size(80, 15));
+        var json = EmbeddedResourceReader
+            .LoadResourceStream("Spectre.Console.Tests/Data/example.json")
+            .ReadText();
+
+        // When
+        console.Write(new Panel(new JsonText(json)).Header("Some JSON"));
+
+        // Then
+        return Verifier.Verify(console.Output);
+    }
+}