Rewrite web3-eth-iban

[loredanacirstea]

Description

Part of #3932

Type of change

• 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 not work as expected)

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run dtslint with success and extended the tests and types if necessary.
• I ran npm run test:unit with success.
• I ran npm run test:cov and my test cases cover all the lines and branches of the added code.
• I ran npm run build and tested dist/web3.min.js in a browser.
• I have tested my code on the live network.
• I have checked the Deploy Preview and it looks correct.
• I have updated the CHANGELOG.md file in the root folder.

[loredanacirstea]

I left module.exports = Iban; instead of export default Iban to avoid breaking changes. What do you suggest?

[frankiebee]

module.exports is fine for this

[coveralls]

Pull Request Test Coverage Report for Build 660165167

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 8 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-2.6%) to 73.702%

---

Files with Coverage Reduction	New Missed Lines	%
packages/web3-shh/lib/index.js	1	95.83%
packages/web3-bzz/lib/index.js	2	93.02%
packages/web3-eth-iban/lib/index.js	5	86.49%

Totals
Change from base Build 655426514:	-2.6%
Covered Lines:	3277
Relevant Lines:	4208

---

💛 - Coveralls

[frankiebee]

This is good work! unfortunately it's failing test can take a look and see if i can help figure out why.

[loredanacirstea]

1 check fails:

>>>>>>
HTTP:MAINNET getBlock
>>>>>>
web3-shh package will be deprecated in version 1.3.5 and will no longer be supported.
web3-bzz package will be deprecated in version 1.3.5 and will no longer be supported.
Error: Failed to connect to Infura over websockets after 10 tries
    at getBlockWithRetry (D:\a\web3.js\web3.js\windows_test\basic_usage.js:31:15)

I see other PRs failing with the same issue coming from https://github.com/ChainSafe/web3.js/blob/2c5a8ec7bbb678b8e718a28fd5fec7709bacde25/scripts/js/basic_usage.js#L50

[spacesailor24]

Closing in favor of #3965, there was an update to how Infura links are provided to tests (#3943) and it seems to be causing the failing test