cmd: Show ParaTime transaction details

[matevz]

Fixes #8.

Depends on oasisprotocol/oasis-sdk#1269.

Before:

$ oasis accounts deposit 10 test:dave
Unlock your account.
? Passphrase: 
You are about to sign the following transaction:
{
  "v": 1,
  "call": {
    "method": "consensus.Deposit",
    "body": "omJ0b1UA7UP3UlAm/VN6C/UkSIt8VJ8DmCVmYW1vdW50gkiKxyMEiegAAEA="
  },
  "ai": {
    "si": [
      {
        "address_spec": {
          "signature": {
            "ed25519": "MJ2XCjkj132C9YWpDUSQFjkCTI8bSw8bi0w9EwwE1Bg="
          }
        },
        "nonce": 0
      }
    ],
    "fee": {
      "amount": {
        "Amount": "1131000000000000",
        "Denomination": ""
      },
      "gas": 11310,
      "consensus_messages": 1
    }
  }
}

Network:  testnet
Paratime: sapphire
Account:  test

After:

$ oasis accounts transfer 10 test:dave
Unlock your account.
? Passphrase: 
You are about to sign the following transaction:
Format: plain
Method: accounts.Transfer
Body:
  To: test:dave (oasis1qrk58a6j2qn065m6p06jgjyt032f7qucy5wqeqpt)
  Amount: 10.0 TEST
Authorized signer(s):
  1. MJ2XCjkj132C9YWpDUSQFjkCTI8bSw8bi0w9EwwE1Bg= (ed25519)
     Nonce: 0
Fee:
  Amount: 0.000231 TEST
  Gas limit: 2310
  (gas price: 0.0000001 TEST per gas unit)

Network:  testnet
ParaTime: sapphire
Account:  test

Before:

$ oasis tx show testtx2.json 
{
  "Body": "o2F2AWJhaaJic2mBomVub25jZQFsYWRkcmVzc19zcGVjoWlzaWduYXR1cmWhZ2VkMjU1MTlYIDXD8zVt2FNk/roDVLVFraEJ0b2zi/XWEmgX24xyz9aRY2ZlZaJjZ2FzAWZhbW91bnSCQEBkY2FsbKJkYm9keaJidG9VAMjQ9FnbOOXMMcp35m0sRFbcvrUCZmFtb3VudIJIDeC2s6dkAABAZm1ldGhvZHFhY2NvdW50cy5UcmFuc2Zlcg==",
  "AuthProofs": [
    {
      "signature": "mxOARaaRkHrHiUObGO2KbUXZhmbIS2h3hsRM+3Y/DzvMtbVdwcZm2EZ7oP7dR5XHKkrQnjMwZnkT0mdZUsLIBw=="
    }
  ]
}

Network:  testnet
ParaTime: sapphire

After:

$ oasis tx show testtx2.json 
Hash: 3013be1ba6e1ef17921382f01b53f519174b2f35753d1fc37ad11bfc382f51f5
Signer(s):
  1. NcPzNW3YU2T+ugNUtUWtoQnRvbOL9dYSaBfbjHLP1pE=
     (signature: mxOARaaRkHrHiUObGO2KbUXZhmbIS2h3hsRM+3Y/DzvMtbVdwcZm2EZ7oP7dR5XHKkrQnjMwZnkT0mdZUsLIBw==)
Content:
  Format: plain
  Method: accounts.Transfer
  Body:
    To: test:bob (oasis1qrydpazemvuwtnp3efm7vmfvg3tde044qg6cxwzx)
    Amount: 1.0 TEST
  Authorized signer(s):
    1. NcPzNW3YU2T+ugNUtUWtoQnRvbOL9dYSaBfbjHLP1pE= (ed25519)
       Nonce: 1
  Fee:
    Amount: 0.0 TEST
    Gas limit: 1
    (gas price: 0.0 TEST per gas unit)

Network:  testnet
ParaTime: sapphire