feat: introduce new FrameworkId type

[dario-piotrowicz]

Summary

It's pretty minor, but as a consumer of the build-info library I think it would be pretty nice if the id of frameworks could be an actual union of the known ids instead of string (this would help writing more type-safe code and also be more convenient for intellisense and autocompletion), so I figured I could try to open a PR to propose just that and see what y'all think 🙂.

The downside here is that when someone adds (or removes) a new framework they also need to update the FrameworkId union type as well, this seems pretty ok as a tradeoff to me for better type safety but up to you 🙂 (again this change is not super essential, but definitely something I'd like to take advantage of when using the library 😄)

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