Add transaction builder

[rantan]

Implement Transaction Builder to create a mixture of remittance and issuance of multiple assets and remittance of TPC in one transaction.

Steps

• Design public interface and review on this issue.
• Impl the interface and create PR

[Yamaguchi]

TransactionBuilder.new
    .issue(issuer:, token_type:, amount:)
    .transfer(token:, sender:, receiver:, amount)
    .burn(token:, sender:, amount)
    .reissue(token:, amount)
    .payment(sender:, receiver:, amount)
    .build()
=> [[Token], [Tapyrus::Tx]]
(発行したトークンの配列, ブロードキャストするTxの配列)

[Yamaguchi]

issue method can be separated by 3 types.

TransactionBuilder.new
    .reissuable(issuer:, amount:)
    .non_reissuable(issuer:, amount:)
    .nft(issuer:)
    .transfer(token:, sender:, receiver:, amount)
    .burn(token:, sender:, amount)
    .reissue(token:, amount)
    .payment(sender:, receiver:, amount)
    .build()
=> [[Token], [Tapyrus::Tx]]

[Yamaguchi]

build() method may return multiple transactions because 2 transactions will be needed to issue new reissuable token