BD-2992. Add encryptOptions to push tx method. Encrypt content field for push tx.

[andreyvEze]

now to send fio request for example you could:

await fioSdk.genericAction('pushTransaction', {
        action: 'newfundsreq',
        account: 'fio.reqobt',
        data: {
          payer_fio_address: 'payer-address@domain',
          payee_fio_address: 'payee-address@domain',
          content: {
            payee_public_address: 'pubKey',
            amount: 2,
            chain_code: 'FIO',
            token_code: 'FIO',
            memo: 'hello',
            hash: '',
            offline_url: ''
          },
          max_fee: 200000000
        }
      })