feat(s3-deployment): allow specifying memory limit

[eladb]

when deploying large files, users may need to increase the resource handler's memory configuration.

note: since custom resource handlers are singletons, we need to provision a handler for each memory configuration defined in the app. we do this by simply adding a suffix to the uuid of the singleton resource that includes the memory limit.

fixes #4058

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[davidsteed]

I was deploying a web site that grew so that I had this issue. When I updated memoryLimit: 256,
I could no longer deploy the site as I got the error

XXX/DeployWithInvalidation/CustomResource/Default (XXXDeployWithInvalidationCustomResource4FB1CEFA) Modifying service token is not allowed.

Does this mean that once you have set a limit it cannot be changed.