Macos key storage

[kernelkind]

V1 was submitted here: https://groups.google.com/a/damus.io/g/patches/c/LTYdujjrLRs/m/Rg_VQoWhBgAJ

V1 -> V2:

• Added conditional compilation for security_framework and macos_key_storage.rs
• ignore the tests so the test runner doesn't run them concurrently
• App compiles and runs on linux vm.

[jb55]

thanks!