Allow readonly arrays on `Value` type

[evanob]

We're using types generated via OpenAPI, which results with some nested types like tags: readonly string[]. This is not allowed by the current Value type from @electric-sql/client.

We would like to see support for readonly arrays too.

 export type Value<Extensions = never> =
   | string
   | number
   | boolean
   | bigint
   | null
   | Extensions
   | Value<Extensions>[]
+  | readonly Value<Extensions>[]
   | { [key: string]: Value<Extensions> }