Remove all java-dependencies

[ligi]

This is more a long-term goal. But it would be nice to get rid of java-dependencies to use Kotlin-Native and compile to WASM/JS/..

Breakdown of this meta-issue in smaller issues:

• [x] RIPEMD160 https://github.com/walleth/kethereum/issues/33
• [ ] SHA-2 / SHA-256 https://github.com/walleth/kethereum/issues/34
• [ ] Replace Moshi with Kotlinx serializing https://github.com/walleth/kethereum/issues/31
• [ ] SpongyCastle #44
• [ ] TODO - Identify more java dependencies

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[ligi]

One step just gone in this direction is: https://github.com/walleth/sha3 hashing-wise we still need rimpemd160 and sha-256 (sha-2)