Generalize the type of reactInit

[MaxHearnden]

slightly generalize the type of reactInit. This allows for passing parameters using ReaderT without passing a parameter when the react handle is created.

[ivanperez-keera]

Do not merge this yet.

[ivanperez-keera]

I'm closing this at this point. I'd like the way that we incorporate code to follow a slightly more organized process.

You can get a glimpse of it at:

• https://github.com/ivanperez-keera/dunai#contributions
• https://github.com/ivanperez-keera/dunai/discussions/357

Please start with a discussion under https://github.com/ivanperez-keera/dunai/discussions. (I can be a question or idea.) From there, we can decide to actually address it, and then we'll create the issue, assign it, and accept PRs.

Thanks!