SpatialPoint Serialization/Deserialization: Fixes spatial point serialization/deserialization bug

[dibahlfi]

Pull Request Template

Description

This change is to fix serialization/deserialization bug in the Point class. Please see(#4744) for more information.

The crux of the problem is the use of both .NET native(System.Text.Json) and Newtonsoft serialization libraries in the codebase. The core class that does the serialization of Point is CosmosSystemTextJsonSerializer which uses .NET native library but the Point/Position classes are built leveraging Newtonsoft library so attributes like [JsonConverter(typeof(PositionJsonConverter))] in the Position class are not kicking in to do their job as they are Newtonsoft contructs and don't get invoked when serialization happens using .NET native(System.Text.Json) library.

To fix the issue I had to relax the visibility levels of constructors and a readOnly collection. An alternative could be to create a new subclass of CosmosLinqSerializer that uses Newtonsoft but that is more involved and could have broader implications.

Type of change

Please delete options that are not relevant.

• [] Bug fix (non-breaking change which fixes an issue)

Closing issues

To automatically close an issue: closes #4744

[kirankumarkolli]

nit: Add the strings as const at the class level

[kirankumarkolli]

For other converters too

[dibahlfi]

still making changes to the codebase. Please hold off on the review.

[kirankumarkolli]

Its materializing the value to string and Deserialize<> will parse string and convert to JsonElement again.
Number of points might be higher in a single response increasing the overhead.

[kirankumarkolli]

https://learn.microsoft.com/en-us/dotnet/api/system.text.json.jsonserializer.deserialize?view=netstandard-2.0#system-text-json-jsonserializer-deserialize(system-text-json-jsonelement-system-type-system-text-json-serialization-jsonserializercontext)

Might help avoid the materialization

[dibahlfi]

still making changes to the codebase. Please hold off on the review.

[dibahlfi]

code changes done. Please review.

[kirankumarkolli]

Is null check needed front to cover for null assignment scenarios?

[dibahlfi]

still making changes to the codebase. Please hold off on the review.

[dibahlfi]

code changes done. Please review.

[kirankumarkolli]

Is this type used?

[dibahlfi]

still making changes to the codebase. Please hold off on the review.

[dibahlfi]

code changes done. Please review.

[kirankumarkolli]

All these tests needs to run for both STJ and newtonsoft.
Simple dirty way to achieve it might be

        public static IEnumerable<object[]> Serializers
        {
            get
            {
                yield return new object[] { new CosmosJsonDotNetSerializer() };
                yield return new object[] { new CosmosSystemTextJsonSerializer(new JsonSerializerOptions()) };
            }
        }
        
        /// <summary>
        /// Tests serialization/deserialization.
        /// </summary>
        [TestMethod]
        [DynamicData(nameof(Serializers))]
        public void TestPointSerialization(CosmosSerializer serializer)

            var point = serializer.FromStream<Point>(new MemoryStream(Encoding.UTF8.GetBytes(json)));

[kirankumarkolli]

This needs to be covered for all spatial tests.

[dibahlfi]

still making changes to the codebase. Please hold off on the review.

[dibahlfi]

code changes done. Please review.

[sourabh1007]

If you are still making the changes, you can convert this PR to "draft" mode.

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