Advanced SAST support for iOS
This epic tracks work to enable Advanced SAST for iOS (Swift and Objective-C).
### Scope
Unlike other language-support epics, this epic _does not_ necessarily include enabling cross-file/cross-function support for these languages. The reason is that the existing rule coverage for Swift and Objective-C does not include any taint-based rules (search [sast-rules](https://gitlab.com/gitlab-org/security-products/sast-rules) for `swift` and `objective-c`). As such, translating the appropriate rules would be sufficient.
### Benefit
The benefit of making this conversion (limited as it is) is that it will reduce customers' need to run both Semgrep-based scanning and Advanced SAST.
### Documentation
Documentation should be clear that the coverage for iOS (implemented as checks for Swift and Objective-C) is not cross-file/cross-function.
epic