> Modifications:
1. Fixes a latent Let/Set code block creation bug: creating a code block from parameterized Get prototypes fail.
2. Adds `DeclarationType.PropertyLet` and `DeclarationType.PropertySet` to the list of valid prototypes for generating code.
Item 1: Discovered while working with `CodeBuilder` to resolve #5886.
Item 2: The resolution to #5886 _should_ look a lot like `IntroduceGetAccessorQuickFix`. However, `IntroduceGetAccessorQuickFix` is not using the `CodeBuilder`. Th