Fix libpq parsing and refactors/code cleanup

pgLabII.PgUtils/ConnectionStrings/ConnectionDescriptorBuilder.cs

@@ -0,0 +1,36 @@
+using Npgsql;
+
+namespace pgLabII.PgUtils.ConnectionStrings;
+
+public sealed class ConnectionDescriptorBuilder
+{
+    private List<HostEndpoint> Hosts { get; } = [];
+    public string? Database { get; set; }
+    public string? Username { get; set; }
+    public string? Password { get; set; }
+    public SslMode? SslMode { get; set; }
+    public string? ApplicationName { get; set; }
+    public int? TimeoutSeconds { get; set; }
+    public Dictionary<string, string> Properties { get; } = new(StringComparer.OrdinalIgnoreCase);
+
+    public void AddHost(string host, ushort? port)
+    {
+        if (string.IsNullOrWhiteSpace(host)) return;
+        Hosts.Add(new HostEndpoint { Host = host.Trim(), Port = port });
+    }
+
+    public ConnectionDescriptor Build()
+    {
+        return new ConnectionDescriptor
+        {
+            Hosts = Hosts,
+            Database = Database,
+            Username = Username,
+            Password = Password,
+            SslMode = SslMode,
+            ApplicationName = ApplicationName,
+            TimeoutSeconds = TimeoutSeconds,
+            Properties = Properties
+        };
+    }
+}