refactor: Use ref structure types (#114)

See https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/ref-struct

Author: MrDave1999

src/Common/Results/ResultOfT.cs

@@ -4,7 +4,7 @@
 /// Represents the result of an operation.
 /// </summary>
 /// <typeparam name="T">A value associated to the result.</typeparam>
-internal readonly struct Result<T>
+internal readonly ref struct Result<T>
 {
     /// <summary>
     /// Gets the value associated with the result.

src/Parser/Line.cs

@@ -3,7 +3,7 @@ namespace YeSql.Net;
 /// <summary>
 /// Represents a line of text from a file.
 /// </summary>
-internal readonly struct Line
+internal readonly ref struct Line
 {
     /// <summary>
     /// Gets the number/position of the line.