ESQL: Enforce non-finite semantics declaration

Following up on #157650 - we want each **existing and future** function and operation in ES|QL to make a conscious decision on whether or not it takes special care of non-finite numbers.
We may do something like (or completely piggyback off of) [ApproximationSupportTests](https://github.com/elastic/elasticsearch/blob/657b990d69446bcd7dfc760b47f65ffd5d1c0774/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/approximation/ApproximationSupportTests.java#L144).

cc @sidosera @alex-spies