Support mapping all webform composite elements

Created a merge request. I tested this out with webform_address, webform_name, webform_contact, and a composite element that I created via custom code, and they all mapped as expected.

However, I couldn't get it to work with the "Custom composite" webform element that's provided OOTB by webform. I'm still looking into it, but this MR gets it a bit closer.

I can also post a traditional patch file if that's helpful.

+1 I need this functionality too

Updated the MR to allow for webform's ootb custom composite element, which was failing because it's a nested array. This is ready for review.

@origami - can you test this out if you have an opportunity?

Merge request 42 in #comment-15032950 (#6) downloaded as patch, works wonderfully in our case (PHP 7.4, D9.5.9)

Again, tested in PHP 7.4, D9.5.9. Custom composite element mapped successfully

I also tested the patch from the merge request in #comment-15032950 (#6) and it worked as intended. I was able to map a Contact field (composite) Company field (sub-field) to a Salesforce Object and confirmed the data was sent correctly.

PHP 8.1, D9.5.1.

Merged to 5.0.x, new release coming shortly.

Thanks for your contrib!

Automatically closed - issue fixed for 2 weeks with no activity.