Add support to UnwrapElement for marshaling CPython dictionary

[aparajit-pratap]

Purpose

https://jira.autodesk.com/browse/DYN-5119 Add support to UnwrapElement for marshaling CPython dictionary

I basically tested the fix with the RC2.15_Revit2023.1 branch based on the Revit version I have installed, which is why I'm making this PR to that branch. I guess this will need to be cherry-picked into master as well.

I'm not sure where to add D4R tests. I remember writing tests for RTF but I don't have the setup anymore nor do I know if that's used anymore. Would need some help here.

Declarations

Check these if you believe they are true

• [x] The code base is in a better state after this PR
• [ ] Is documented according to the standards
• [ ] The level of testing this PR includes is appropriate
• [ ] User facing strings, if any, are extracted into *.resx files
• [ ] Snapshot of UI changes, if any.

Reviewers

@mjkkirschner

FYIs

@QilongTang @wangyangshi

[wangyangshi]

do you have any other changes, can I merge it now?

[wangyangshi]

add reviewer @ShengxiZhang

[wangyangshi]

have merged to master and RC2.16.1_Revit2023