Move transaction module in framework to inside of blocks module

[shuse2]

Description

Currently, transaction module is separated from blocks module, but it should be inside of blocks module like

/blocks
  index.js
  /transactions
    transaction_handler.js
    index.js

Additionally, interface_adapter is only used for transaction, so it also should be in the blocks module

Also, relevant functions which are used from upper layer need to be exported from the blocks module.

Motivation

Because blocks module is responsible for saving and applying the transaction, transaction module is sub-domain of the blocks module

Acceptance Criteria

• All tests related to transactions module needs to be moved