Avoid using `any` type

[moltar]

I really like this package and the fact that a company with a strong engineering background is behind it.

But the use of any everywhere is really deterring me from using this.

Especially in the cases where types are most needed, such as rule creation:

https://github.com/cloudflare/authr/blob/3f6129d97d06e61033a7f237d84e35e678db490f/ts/src/rule.ts#L39

But the same pattern is used everywhere.

It is best practice to never use any, and in those cases where you truly don't know what the type should be, then use unknown type.