Migration support: v3 to v4 (end of September 2024)

[arhtudormorar]

Breaking changes brought by v4:

• upgrade @multiversx/sdk-core peer dependecy to >= 13.5.0
• make isConnected() return boolean instead of Promise<boolean>
• make login return an IProviderAccount object instead of string

🟡 BEFORE - performing a login action in v3

const address = await ExtensionProvider.getInstance().login();

🟢 UPDATE - performing a login action in v4

const { address }  = await ExtensionProvider.getInstance().login

• upgrade signMessage to use Message

🟡 BEFORE - signing a message in v3

const message = new SignableMessage({
            message: Buffer.from("hello")
        });

const signedMessage = await this.provider.signMessage(message);

🟢 UPDATE - signing a message in v7

const messageToSign = new Message({
            data: Buffer.from("hello"),
            address: Address.fromBech32("erd1qyu5wthldzr8wx5c9ucg8kjagg0jfs53s8nr3zpz3hypefsdd8ssycr6th")
        }); 

const signedMessage = await this.provider.signMessage(messageToSign);

Additional non-breaking changes

• added public methods getAccount and setAccount