(Feature) Validate imported whitelist addresses

[fvictorio]

Depends on #656. Closes #641.

[vbaranov]

@fvictorio could you clarify which types of validations we cover with this PR? do we need more validations, or it covers all possible validations?

[fvictorio]

It performs the same validations that are done when you type an address in the input (it just uses Web3.util.isAddress).

[vbaranov]

Ok, I see. The issue is that when we import an address with individual min cap > individual max cap there is no validation for now. will it be resolved in the frame of #578 ?

[fvictorio]

Oh, no, the min an max cap are not being validated (it just checks that they are numbers). We should think of a way to have those validations in a single place and use that both when importing a CSV and when typing an address.

Do you think we should do that as part of this PR?

[vbaranov]

Do you think we should do that as part of this PR?

No. I think we could merge it. I mentioned here just to not forget to do this as a part of #578 or as a separate issue. @fvictorio please create a new issue if you prefer to do it on a separate one.