Consider changing `ArithmeticException` to `NumberFormatException` in `BigDecimal::parseStringWithMode`.

[vdshb]

BigDecimal::parseStringWithMode throws ArithmeticException when input argument is not correctly formatted number. This is a suggestion to enhance API and change it to NumberFormatException as a better choice for this matter (BigInteger::parseString is already using NumberFormatException).

Usages:

https://github.com/ionspin/kotlin-multiplatform-bignum/blob/86b22ce0e2a2b0e163192a1670fe4e0362d5a0ac/bignum/src/commonMain/kotlin/com/ionspin/kotlin/bignum/decimal/BigDecimal.kt#L984

https://github.com/ionspin/kotlin-multiplatform-bignum/blob/86b22ce0e2a2b0e163192a1670fe4e0362d5a0ac/bignum/src/commonMain/kotlin/com/ionspin/kotlin/bignum/decimal/BigDecimal.kt#L1038

[ionspin]

Thanks, you are right, this should be a NumberFormatException, although since this would be a breaking API change, it would need to go to 0.4.0 as the next major release.