chore: add balance & blocknumber notifier

[guanbinrui]

Description

This PR introduces two notifier state: BlockNumberNotifierState and BalanceNotifierState. Here is a code snippet to reveal how to use a notifier.

// The sender could be transaction state listener
BalanceNotifier.emitter.emit('update', {
    account: '0x...',
    chainId: ChainId.Mainnet,
})

// The listener is the `useBalance` hook
function useBalance(address: string) {
    const { BalanceNotifier } = useWeb3State()
    const asyncResult = useAsyncRetry(async () => { /** get balance **/ })
    
    useEffect(() => {
        return BalanceNotifier.on(() => {
            asyncRetry.retry()
        })
    }, [BalanceNotifier])

    return asyncResult
}

Closes # (NO_ISSUE)

Type of change

• Documentation
• Code refactoring (Restructuring existing code w/o changing its observable behavior)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (a fix or feature that would make something no longer possible to do/require old user must upgrade their Mask Network to this new version)

[github-actions]

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