Handle big decimal in input

[anderseknert]

Something like sprintf("%s", 2e308) found inside of a policy currently has Jarl parsing 2e308 as a double with the value set to Infinity. We should allow reading these values the same way OPA does, using BigDecimal or whatever is most appropriate. We'd also need to ensure that all builtins dealing with numbers work with this as well.

As an aside, the Rego Playground seems to have problems with this as well, and x := 2e308 will render {"x": null} :)

[anderseknert]

ClojureScript doesn't handle BigInt / BigDecimal values like Clojure. While we could probably work around this, these are generally not used in policy, and as such not prioritized. Will ignore any tests for these when the target is cljs.