Verification of signatures created by keys generated not in SDK are not successful

[rkharisov]

Precondition: keypair generated not in SDK, for example with command docker run soramitsu/ed25519-keypair, and signature for some message created with the keypair

Current behaviour: signature verification is not successful

Expected behaviour: signature verification is successful

[rkharisov]

Found out what keys created by docker run soramitsu/ed25519-keypair are not compatible with Iroha2 and signature is not verified. Look's like keypair generation mechanism is differ then expected by SDK and Iroha2. Therefore SDK works as expected and no changes required

P.S. Internally image soramitsu/ed25519-keypair run script derived from this repository

P.P.S For proper keypair generation possible to use this command docker run hyperledger/iroha2:crypto-cli-dev

Feel free to reopen issue if required