updating web3 utils BN

[luu-alex]

Was testing 1.7.4-rc.1 and many open zeppelin testcases were breaking due to the change of updating BN, this was due to us adding BNwrapped and not adding the prototype and attributes.

This PR adds the methods/attributes to the BN object and allows the synthetix tests to pass.

[render]

Your Render PR Server URL is https://web3-js-pr-5132.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-cajti94gqg46e5e17g3g.

[coveralls]

Pull Request Test Coverage Report for Build 2496163757

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 72.174%

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Totals
Change from base Build 2460883276:	0.02%
Covered Lines:	3382
Relevant Lines:	4415

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💛 - Coveralls

[nazarhussain]

One more thing I observed is that the bundle size for this RC release is increased. Do you suspect any particular reason for it?

[luu-alex]

@nazarhussain has the bundlesize increased? running npm run bundlesize locally for both 1.7.3 and 1.7.4-rc.1 give me the size of 1.39mb

[nazarhussain]

@luu-alex Please check this https://bundlephobia.com/package/[email protected]

[luu-alex]

@nazarhussain Ah I see, I believe the bundle size becoming larger is due to upgrading ether packages we were using. To note, our bundle now includes @ethersproject/[email protected]