l1: make logger a functional option in NewClient

### Context

Follow-up from review of #3738.

`l1.NewClient` currently takes `logger log.StructuredLogger` as a required positional parameter:

```go
func NewClient(
    provider L1StateProvider,
    chain *blockchain.Blockchain,
    logger log.StructuredLogger,
    opts ...Option,
) *Client
```
