[ADD] Support multicall v2

[tungnguyen20]

The multicall v2 supported contracts can be found here

[DarthMike]

@tungnguyen20 Thanks for the PR! Please address the linting issue by running [prepareForPush.sh](https://github.com/argentlabs/web3.swift/blob/develop/scripts/prepareForPush.sh) and also we'll need an integration test against a Goerli contract to be sure it works fine and it won't break with future changes

[tungnguyen20]

@DarthMike I just run the script and add test cases. Please help me continue.

[DarthMike]

Some tests will fail (see #311). But we can run anyway for now

[tungnguyen20]

Yeah I see :D

[DarthMike]

@tungnguyen20 You can merge develop and tests should pass now

[tungnguyen20]

I merged the develop branch. Please help me merge this pull request. Thank you.

[DarthMike]

@tungnguyen20 strangely this PR is now failing in other tests even though there's nothing changed that would affect it.
I run CI on develop and it's passing correctly (https://github.com/argentlabs/web3.swift/actions/runs/4182648660) , trying again

[tungnguyen20]

Looks like the private key is missing. Please check it.

[DarthMike]

Hm I don't understand why, but pulled the changes manually to see if it changes will work in CI
#313

[tungnguyen20]

Hmm. Don't know why. It passed 😂

[tungnguyen20]

I think I will close this PR and reopen a new one which is checked out from latest develop

[DarthMike]

@tungnguyen20 you can update from latest develop, I found out why (040ad81)

[tungnguyen20]

@DarthMike Yah I updated. Hope it will work 😁