Stop nu panicks in math.round on a large decimal value(Most of the time) (#3224)

* Stop crashing when dealing with large numbers in math round

* Fix formatting

* add tests

* just to trigger wasm build

* trigger wasm build

crates/nu-command/tests/commands/math/mod.rs

@@ -1,6 +1,7 @@
 mod avg;
 mod eval;
 mod median;
+mod round;
 mod sum;
 
 use nu_test_support::{nu, pipeline};