Move solution and projects to src

Spv.Generator/DeterministicStringKey.cs

@@ -1,30 +0,0 @@
-using System;
-using System.Diagnostics.CodeAnalysis;
-
-namespace Spv.Generator
-{
-    internal class DeterministicStringKey : IEquatable<DeterministicStringKey>
-    {
-        private string _value;
-
-        public DeterministicStringKey(string value)
-        {
-            _value = value;
-        }
-
-        public override int GetHashCode()
-        {
-            return DeterministicHashCode.GetHashCode(_value);
-        }
-
-        public bool Equals(DeterministicStringKey other)
-        {
-            return _value == other._value;
-        }
-
-        public override bool Equals([NotNullWhen(true)] object obj)
-        {
-            return obj is DeterministicStringKey && Equals((DeterministicStringKey)obj);
-        }
-    }
-}