Added functionality for multiple wallets

[ismail9001]

• Storing by address
• Fetching list of wallets
• Deleting by address

[DarthMike]

Hello @ismail9001 what's the use-case for this change? Not sure if needed in the library

[ismail9001]

Hello @DarthMike!
Unfortunately, your library is limited to working with only one wallet.
In my case, the library did not allow me to get a list of previously created accounts without duplicating the stored password information and address lists in the additional storage.

I think these features will add popularity to your library

[DarthMike]

@ismail9001 OK makes sense. Not sure if this exact implementation woud be the best, but need to think about it (i.e. always assuming more than one account). I'll post review comments.

[ismail9001]

Thank you, I'll be waiting

[DarthMike]

@ismail9001 Just reviewed the code, I think APIs would be better if we change them, see the comments in code.

[DarthMike]

Thanks now it's looking good

[DarthMike]

@ismail9001 Looks good, but we need to do PR against develop. After conflicts solved we'll run the tests in CI

[ismail9001]

I changed destination of PR to develop

[DarthMike]

@ismail9001 test failing when deleting keys in Linux
Test Case 'EthereumKeyStorageTests.testDeleteAllPrivateKeys' started at 2022-07-11 15:13:14.682 Could not delete address: Error Domain=NSCocoaErrorDomain Code=4 "The file doesn’t exist." Could not delete addresses: failedToDelete /__w/web3.swift/web3.swift/web3sTests/Account/EthereumKeyStorageTests.swift:86: error: EthereumKeyStorageTests.testDeleteAllPrivateKeys : failed - Failed to delete all private keys: failedToDelete

[ismail9001]

I added an address output to check the reason for the test crash. Please run the test on linux

[ismail9001]

Please run tests again

[ismail9001]

On Linux was strange error

/__w/web3.swift/web3.swift/web3sTests/ERC721/ERC721Tests.swift:150: error: ERC721MetadataTests.test_ReturnsMetatada : failed - Expected tokenMetadata but failed dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "The given data was not valid JSON.", underlyingError: Optional(Foundation.JSONError.unexpectedCharacter(ascii: 60, characterIndex: 0)))).

but I didnt change this functionality

[ismail9001]

I tried to find out the cause of the problem, but only managed to find out that the test falls on the line

var metadata = try JSONDecoder().decode(Token.self, from: data) in ERC721Metadata class

what is the problem of the linux test, unfortunately, I cannot say

[DarthMike]

It's passing now, so will merge