Add typing hints

[devos50]

Since the code of AnyDex is particularly error-prone (a single mistake can result in lost money), it would be helpful to add typing hints throughout the code base. #58 did add typing to some files, but there are many files left that require typing to be implemented.

[Solomon1732]

If I open a PR to close this issue (either partially or wholly), should the commit history be one commit per (sub)module?

[devos50]

I would suggest making separate commits and PRs to keep the number of changes small and maintainable 👍