Handle "events" in abi registry

[andreibancioiu]

Implement ResultsParser.parseEvent().

Usage example:

const eventDefinition = abiRegistry.getEvent("deposit");

// Can be taken from a "TransactionOnNetwork" object
const event = new TransactionEvent({
    identifier: "deposit",
    topics: [
        new TransactionEventTopic("ZGVwb3NpdA=="),
        new TransactionEventTopic("cmzC1LRt1r10pMhNAnFb+FyudjGMq4G8CefCYdQUmmc="),
        new TransactionEventTopic("AAAADFdFR0xELTAxZTQ5ZAAAAAAAAAAAAAAAAWQ="),
    ],
    dataPayload: new TransactionEventData(Buffer.from("AAAAAAAAA9sAAAA=", "base64"))
});

const bundle = parser.parseEvent(event, eventDefinition);
console.log(bundle);

A few examples will be added in this PR:
multiversx/mx-sdk-js-examples#28

Related PR on network-providers (required to decode events for Sirius / Node v1.6.0 - as of 13th November 2023, on Testnet):
multiversx/mx-sdk-js-network-providers#49

[andreibancioiu]

Should fix #285.