Add remote path input

[jkodroff]

Hello!

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Issue details

It would be super helpful to allow us to specify the key under which our folder should be synced (asking specifically about S3 here). For example,

I want to be able to do this:

const folderSync = new syncedFolder.S3BucketFolder("environment-vpc", {
  acl: aws.s3.PublicReadAcl,
  bucketName: bucket.bucket,
  objectKey: "environment-vpc",
  path: "../environment-vpc",
}, {
  dependsOn: rmNodeModules,
});

In order to get local file ../environment-vpc/foo.txt to sync to s3://my-bucket/environment-vpc/foo.txt. Without the objectKey option, I have to reorg my code to move ../environment-vpc up a level to ../proton-templates/environment-vpc in my local filesystem and I have to sync all 3 planned folders now under proton-templates in a single S3BucketFolder resource. (I would prefer them to be separate.)