[feature/rp message] Add constrain to parameters and Add callback after blockchain

[crossknight]

According to Wed. 23th Jun. 2021 meeting, I submitted two commits in this pull request as following:

1. Add constrain to initial_salt, message, and purpose parameters.
   • initial_salt string parameter from request and message API size must be larger or equals to 24 characters. (config.saltStrLength, configurable variable like config.saltLength)

• message string parameter from message API size must be less or equals to 1024 characters. (configurable variable via config.messageStrLength)

• purpose string parameter from message API size must be less or equals to 512 characters. (configurable variable via config.purposeStrLength)

• Add new three error types, INITIAL_SALT_TOO_SHORT (20083), MESSAGE_TOO_LONG (20084), and PURPOSE_TOO_LONG (20085), to handle the error that could occur by sending the parameters.

2. Add callback calls after sent data to TM.

• Add a new required parameter, callback_url, to message API.

• Add callback calls after sent Message to TM.

You can find message swagger format APIs here:

1. POST /rp/message

• https://app.swaggerhub.com/apis/crossknight/rp_message/1.0.0

2. GET /utility/message

• https://app.swaggerhub.com/apis/crossknight/utility_message/1.0.0

3. POST /rp/message/:referenceID (since I reached the maximum number to create APIs for a free account, I will attached it as codes)

   openapi: 3.0.0
   servers:
   - url: 'https://virtserver.swaggerhub.com/ndid/rp_callback/0.1'
   info:
   version: "4.0"
   title: RP Message Callback API
   description: API that RP MUST IMPLEMENT to be called by the platform
   paths:
   '/rp/message/{reference_id}':
   post:
     summary: Update from NDID
     description: 'Update from NDID to RP, there''s been an update to the status. Note that {reference_id} is NOT automatically append to the registered callback url. This is just an example that you can register callback with reference_id as parameter'
     operationId: request_update
     parameters:
       - name: reference_id
         in: path
         description: Reference ID
         required: true
         schema:
           type: string
     responses:
       '204':
         description: Status Update Acknowledged
     requestBody:
       content:
         application/json:
           schema:
             oneOf:
               - $ref: '#/components/schemas/CallbackCreateMessageResult'
       description: Callback about message
       required: true
   components:
   schemas:
   CallbackCreateMessageResult:
     type: object
     required:
       - node_id
       - type
       - reference_id
       - message_id
       - success
     properties:
       node_id:
         type: string
       type:
         type: string
         enum:
           - create_message_result
       reference_id:
         type: string
       message_id:
         type: string
       creation_block_height:
         type: string
         description: '<CHAIN_ID>:<BLOCK_HEIGHT>'
       success:
         type: boolean
       error:
         $ref: '#/components/schemas/Error'
   Error:
     type: object
     required:
       - code
       - message
     properties:
       code:
         type: integer
       message:
         type: string