chore: Expose StripeFactory so users can write them in struct

[Xuanwo]

This PR will expose StripeFactory so users can write in a struct like:

pub struct ORCSourceForCopy {
    table_ctx: Arc<dyn TableContext>,
    scan_progress: Arc<Progress>,
    op: Operator,
    reader: Option<(
        String,
        Box<StripeFactory<OrcChunkReader>>,
        HashableSchema,
        usize,
    )>,
}

I'm not sure if that's the best API we can have, maybe we can polish this part later.

[waynexia]

🤣 LGTM