feat: Add proper MacOS support

[Thunder-Blaze]

Description

strfry currently only builds on Linux. This PR makes it build and run on macOS and adds a GitHub Actions workflow to keep it that way.

Issue

• fixes Portability: Linux-only inotify / eventfd dependency blocks macOS builds #189

Depends On

• hoytech-cpp #1
• session-token-cpp #1
• After the above 2 get merged and the submodules get bumped in strfry, it will be fully ready to get merged

Testing

• Please refer to hoytech-cpp #1 as I have added all the relevant screenshots there of both Linux and MacOS

[Thunder-Blaze]

This is now complete and ready for review

• Once the PR's in hoytech-cpp and session-token-cpp are merged and the submodules are bumped, The CI checks will start passing

[hoytech]

Looking good so far, thank you! I'm still reviewing the dependency PRs, I hope to merge them all soon.