Add operator 'rem' as extension to BigInteger

#KT-14650 Fixed

 Note that after this change behaviour of '%' on BigInteger is changed,
now it works like a proper remainder

compiler/testData/codegen/light-analysis/operatorConventions/percentAsModOnBigIntegerWithoutRem.txt

@@ -0,0 +1,3 @@
+public final class PercentAsModOnBigIntegerWithoutRemKt {
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+}