Convert Map and Set to use lambdas

[gbrail]

• Convert NativeMap to lambda
• Partial work on lambdas for native map and set.
• Use aliases for properties that need to be the same

[rbri]

@gbrail had a quick look at this - looks good and another minor step forward.

Just saw that some WeakMap/Set tests are still failing - i guess our code does not accept symbols as weak map keys.

https://tc39.es/ecma262/multipage/executable-code-and-execution-contexts.html#sec-canbeheldweakly

Maybe you can fix that on the way...

[gbrail]

Thanks for the feedback -- I'm a bit behind on this because I ran in to some serialization difficulties with another lambda-related PR and I want to understand all that. I wish that serialization would just go away (and TBH a few years ago I believe the Java community was advocating for that) but it didn't and I believe that continuations use it so I'm going to keep on trying to figure it out.

[aardvark179]

Getting rid of the current serialisation code will be a long road, even though it is one of the most painful things a whole load of JDK stuff.

I like the way this lambda stuff in general as I think it aligns nicely with long term ideas I have round slot maps and properties.