Delegate to platform implementations to take advantage of hardware-level support

On the JVM the JCE is available which implements many cryptographical operations. Krypto should avoid using pure-kotlin implementations, but there should be an option to switch back to Kotlin-only in case of a flawed platform.

No files, tests, or entry points are named. Start by locating Krypto's pure-Kotlin cryptographic implementations and reviewing how JVM platform code can access JCE. Done means JVM implementations can delegate to JCE while retaining an option to use the Kotlin-only implementations when platform support is flawed.

Written by the indexing model from the issue text.