Multiplatform support for BigDecimal/BigInteger

[aSemy]

YAML has no restrictions on how large or precise numbers can be.

Kotlin Multiplatform does not support numeric types that can represent such large numbers.

Options

• actual/expect for each platform
• Represent large numbers as a string, to be converted by each platform manually
• Use an external library (e.g. https://github.com/ionspin/kotlin-multiplatform-bignum/)

[russellbanks]

KMath also provides a multiplatform BigInt implementation in their core module. Both seem like good libraries.