Fix bug where two decimal numbers added give wrong output

[NickSneo]

Description

I have added a fix for bug where two decimal numbers when added gives wrong output

Motivation and Context

In the code when comparing the totalSupply of token and addition of all partitions of token is done, it wasn't matching because the addition was done in Type "Numbers", to fix we have added a function which first coverts them into BigNumber and then add.
For example -
const num1 = 11031862.87;
const num2 = 2.03;

(current scenario)
const result1 = num1 + num2;
console.log(result1); // Output: 11031864.899999999

(fixed scenario)
const bigNum1 = new BigNumber(num1);
const bigNum2 = new BigNumber(num2);

const result2 = bigNum1.plus(bigNum2);
console.log(result2.toString()); // Output: 11031864.9

How Has This Been Tested?

Tested in local environment and nodeJs playgorud - https://codesandbox.io/s/bignumber-js-forked-u4qny6

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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[NickSneo]

I have read the CLA Document and I hereby sign the CLA