[Improve][Redis] Redis reader use scan cammnd instead of keys, single mode reader/writer support batch

[FuYouJ]

Purpose of this pull request

Does this PR introduce any user-facing change?

• reader use scan cammnd instead of keys to avoid blocking the database from reading data
• In single mode, supports batch read and batch write

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update change log that in connector document. For more details you can refer to connector-v2
  2. Update plugin-mapping.properties and add new connector information in it
  3. Update the pom file of seatunnel-dist
• Update the release-note.

[Hisoka-X]

Suggested change

	>
	> ### batch_size [int]
	>
	> Ensure the batch write size in single-machine mode; no guarantees in cluster mode.
	>
	### batch_size [int]
	Ensure the batch write size in single-machine mode; no guarantees in cluster mode.

[FuYouJ]

Thank you. I was careless here

[Hisoka-X]

Suggested change

	indicates the number of keys to attempt to return per iteration.default 10
	indicates the number of keys to attempt to return per iteration, default 10

[FuYouJ]

done

[Hisoka-X]

Overall LGTM. Thanks @FuYouJ