This is a counterpart to https://github.com/Quick/Nimble/pull/916, which added support for watchOS to Nimble.

Note that this is a draft until a new version of Nimble is released with watchOS support. Until then this points at main.

I'm also not sure if the tests will run on CI correctly because the tests require watchOS 7.4 to run and I'm not sure what version of watchOS the simulators are configured with.

I also found that the tests weren't compiling (using Xcode 13.2.1) so I've updated these too.