[2.6] utils: Use of native BigInt in BigNumber library breaks support for Safari

[deanpress]

Somewhat related to #3423

Native BigInt (which is used in the toBigNumber() method in the @arkecosystem/utils big-number.ts library) is not yet supported in all popular browsers (e.g. Safari).

Possible Solution

Replace native BigInt with JSBI BigInt in utils: https://github.com/GoogleChromeLabs/jsbi.

The only thing it doesn't support is floats, but from what I observed that isn't supported in the current BigNumber implementation either.

Your Environment

• Version used: 2.6.0-next.9
• Browser Version: Safari 13

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[deanpress]

Closed to move to ArkEcosystem/utils#60

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