Add the ability to use AWS Elastic File System for persistence.

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**Tell us about your request**
What do you want us to build?
Most of my apps generate and persist various files. Being able to utilize EFS for “local” storage would make migrating to App Runner something to look at. Without EFS and VPC access, migrating from our current AWS fargate solution to take advantage of the CI/CD integrations with App Runner makes it a non starter

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

AWS S3 does provide some possibilities but EFS fits the use vase better.

**Additional context**
Anything else we should know?

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