iOS Builds

Greetings,

I noticed that the project's CMake version is set to `3.15`, which should be sufficient for Apple platform builds.
But I took a look at the source & couldn't find [Framework properties](https://cmake.org/cmake/help/latest/prop_tgt/FRAMEWORK.html#prop_tgt:FRAMEWORK) set in CMake configs.

I'm curious if builds for iOS derivatives are currently planned or being considered? If not, and if agreed upon, I'd be happy to submit a pull request to add the FRAMEWORK properties for appropriate targets.

Happy New Year to all!
```[tasklist]
### Tasks
```

First determine whether iOS or related Apple-platform builds are in scope. Then review the CMake configurations and appropriate targets for the missing FRAMEWORK properties; done means the project has an agreed direction and, if accepted, the intended Apple-platform build configuration.

Written by the indexing model from the issue text.