feat: expose types for consumers of the lib

[peterpeterparker]

Motivation

Consumers of the libs should be able to use the TS types in their projects.

Changes

• Expose the types at the root of the library.

Example

import { Wallet } from '@dfinity/oisy-wallet-signer/wallet';
import type {IcrcSupportedStandards} from "@dfinity/oisy-wallet-signer";

const wallet = await Wallet.connect({
    url: 'http://localhost:5174'
});

let supportedStandards: IcrcSupportedStandards | undefined = undefined;