Implement WeakMap and WeakSet

[jfd16]

No description provided.

[lahma]

Thanks for creating this! Can you please add official ECMA tests too under Jint.Tests.Test262\BuiltIns?

using Xunit;

namespace Jint.Tests.Test262.BuiltIns
{
    public class WeakMapTests : Test262Test
    {
        [Theory(DisplayName = "built-ins\\WeakMap")]
        [MemberData(nameof(SourceFiles), "built-ins\\WeakMap", false)]
        [MemberData(nameof(SourceFiles), "built-ins\\WeakMap", true, Skip = "Skipped")]
        protected void Symbol(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public class WeakSetTests : Test262Test
    {
        [Theory(DisplayName = "built-ins\\WeakSet")]
        [MemberData(nameof(SourceFiles), "built-ins\\WeakSet", false)]
        [MemberData(nameof(SourceFiles), "built-ins\\WeakSet", true, Skip = "Skipped")]
        protected void Symbol(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }
}

[lahma]

Looking top-notch, couple remarks and if you want to, you could also tick the feature to be present in the main README.md

[lahma]

Is this needed?

[lahma]

nit: the living spec links can be more useful as they are not tied to specific version https://tc39.es/ecma262/#sec-weakmap-objects

[lahma]

is this needed?

[lahma]

nit: living spec would be better

[lahma]

Thank you once again, great addition 🚀