Implement convenience functions for CFArray <-> Vector conversions and put them to use. I did not have a goal to try to find every place these could be used (that can be done in follow-ups), but rather to find at least one place they could be used, and to write tests for them. I used Darin's Source/WTF/wtf/cocoa/VectorCocoa.h as a basis.
<rdar://problem/100032945>
Pull request: https://github.com/WebKit/WebKit/pull/4423
Committed 254665@main (2f9450c601c6): <https://commits.webkit.org/254665@main> Reviewed commits have been landed. Closing PR #4423 and removing active labels.