fix: Prevent panic by Number::modulo (#773)

In Number::modulo, it calls Number::ints_to_bigint, which could panic. The reason is that calling .to_integer() isn't enough to guarantee that .to_bigint_owned() will return Some, but Number::ints_to_bigint assumes it will and calls unwrap(). In particular, it might be that it's a float corresponding to an integer that's larger than F64_SAFE_INTEGER. The fix is to not call Number::ints_to_bigint (and indeed to delete that entire function, which is only used in this one place), and instead only call unwrap when Some is returned.

tests/interpreter/cases/builtins/numbers/mod.yaml

@@ -62,3 +62,12 @@ cases:
         x = 1 % 1.1
     query: data.test
     error: modulo on floating-point number
+
+  - note: integral float too large to convert
+    data: {}
+    modules:
+      - |
+        package test
+        x = 100000000000000000e-1 % 2
+    query: data.test
+    error: modulo on floating-point number