[Feature Request]: Hardware wallet core capabilities

[Milerius]

Motivation

For the uses of hardware wallet SDK's we need some additional capabilities on the wallet-core side such as unsigned transaction serialization.

Checklist

• [ ] Support serialization of unsigned transaction
  • [ ] Ethereum unsigned tx serialization - Drafted in #2591
  • [ ] Cosmos unsigned tx serialization
  • [ ] Solana unsigned tx serialization
• [ ] Support for additional Solana transaction types.

Research

Ethereum serialization can be done through RLP encoding/decoding Solana/Cosmos have rust SDK with those capabilities.

Resources

• Solana TX
• • https://github.com/paulmillr/micro-sol-signer
• Eth serialization
• Cosmos serialization

Additional Context

C API will be added for swift, wasm and kotling bindings.