feat: Add WriteSchemaAsync method to ISpiceDbClient

A new method, WriteSchemaAsync, has been added to the ISpiceDbClient interface and its implementation in SpiceDbClient. This allows for writing a schema asynchronously.

SpiceDb/ISpiceDbClient.cs

@@ -139,6 +139,8 @@ public interface ISpiceDbClient
 
     Task<List<string>> GetResourcePermissionsAsync(string resourceType, string permission, ResourceReference subject, ZedToken? zedToken = null, CacheFreshness cacheFreshness = CacheFreshness.AnyFreshness);
     string ReadSchema();
+    Task WriteSchemaAsync(string schema);
+
     Task ImportSchemaFromFileAsync(string filePath);
 
     /// <summary>

SpiceDb/SpiceDbClient.cs

@@ -497,6 +497,11 @@ public string ReadSchema()
 		return _spiceDbCore.Schema.ReadSchemaAsync().Result;
 	}
 
+	public async Task WriteSchemaAsync(string schema)
+	{
+		await _spiceDbCore.Schema.WriteSchemaAsync(schema);
+	}
+
 	public async Task ImportSchemaFromFileAsync(string filePath)
 	{
 		await ImportSchemaFromStringAsync(await File.ReadAllTextAsync(filePath));