(Feature) Script to fill chain.json from a CSV file

[igorbarinov]

There is a list of accounts and balances structured as a CSV file with two columns.
First column is ethereum address and second column is value in tokens

0x2c57E1E3AD53F0b971422696c1470cEB84F83B1B,6888412
0xca9B0753E2Ea13d7bBE0e90516Bcf940A275eFA8,540773

In chain.json file there is an accounts section with structure like this

"accounts": {
 "0xDd0BB0e2a1594240fED0c2f2c17C1E9AB4F87126": {
      "balance": "252460800000000000000000000"
    }

Each address from the CSV file should be added to the account section of the chain.json file after all existing entries. Token values should be converted to Wei.

Tests:

• if accounts to be added already exists in the chain.json file the script should panic
• each address to be added should be checked for validity https://ethereum.stackexchange.com/questions/1374/how-can-i-check-if-an-ethereum-address-is-valid

[igorbarinov]

The script should be provided in the master branch in script/ folder.

[igorbarinov]

This issue is for Artem