Change NpgsqlCodec to rely on the DbConnectionStringBuilder class for basic parsing and formatting.

pgLabII.PgUtils.Tests/ConnectionStrings/DbConnectionStringBuilderTests.cs

@@ -0,0 +1,29 @@
+using System.Data.Common;
+using Npgsql;
+
+namespace pgLabII.PgUtils.Tests.ConnectionStrings;
+
+public class DbConnectionStringBuilderTests
+{
+    [Theory]
+    [InlineData("abc", "abc")]
+    [InlineData(" abc ", "abc")]
+    [InlineData("\"abc \"", "abc ")]
+    public void TestDecode(string input, string expected)
+    {
+        DbConnectionStringBuilder sb = new() { ConnectionString = $"key={input}" };
+        string result = (string)sb["key"];
+        Assert.Equal(expected, result);
+    }
+    
+    [Theory]
+    [InlineData("abc", "key=abc")]
+    [InlineData("abc ", "key=\"abc \"")]
+    [InlineData("a\"c", "key='a\"c'")]
+    public void TestEncode(string input, string expected)
+    {
+        DbConnectionStringBuilder sb = new();
+        sb["key"] = input;
+        Assert.Equal(expected, sb.ConnectionString);
+    }
+}