S3 Vector L2 CDK Constructs

[krokoko]

Description

We want to add L2 CDK Constructs for S3 vectors: Index, VectorBucket, VectorBucketPolicy

This is part of the effort to move the Bedrock Knowledge Base construct to the bedrock alpha package

https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/AWS_S3Vectors.html
https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-vectors.html

We have an existing implementation for these here: https://github.com/awslabs/generative-ai-cdk-constructs/tree/main/src/cdk-lib/s3vectors

Roles

Role	User
Proposed by	@krokoko
Author(s)	@krokoko
API Bar Raiser	@alias
Stakeholders	@alias, @alias, @alias

See RFC Process for details

Workflow

• Tracking issue created (label: status/proposed)
• API bar raiser assigned (ping us at #aws-cdk-rfcs if needed)
• Kick off meeting
• RFC pull request submitted (label: status/review)
• Community reach out (via Slack and/or Twitter)
• API signed-off (label status/api-approved applied to pull request)
• Final comments period (label: status/final-comments-period)
• Approved and merged (label: status/approved)
• Execution plan submitted (label: status/planning)
• Plan approved and merged (label: status/implementing)
• Implementation complete (label: status/done)

---

Author is responsible to progress the RFC according to this checklist, and
apply the relevant labels to this issue so that the RFC table in README gets
updated.

[aws-rafams]

Some comments regarding the implementation:

1. Perhaps minor oversight, why is this not simply this.__resource.attrVectorBucketArn?
   https://github.com/awslabs/generative-ai-cdk-constructs/blob/e8ec6d1c0e1ec5df34f5fb035ffcdc345b117c6b/src/cdk-lib/s3vectors/vector-bucket.ts#L604-L610 The overwrite of the service to s3 rather than s3vectors can be problematic

2. Not assigning a vectorBucketName can prove problematic (tested the code)

3. We should not have region and account in VectorBucketAttrs. The Import should leverage the ARN for this. Perhaps use:

return new Import(scope, id, { environmentFromArn: attrs.vectorBucketArn });

4. To get resource names, let's use native CDK syntax

// remove this
this.vectorBucketName = Fn.select(1, Fn.split('/', this.vectorBucketArn));

// use this
this.vectorBucketName = Arn.extractResourceName(this.vectorBucketArn, 'bucket')
// or
this.vectorBucketName = Arn.split(this.vectorBucketArn, ArnFormat.SLASH_RESOURCE_NAME).resourceName!