Provide AWS lambda functions

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Provide common lambda functions to support deploying mstor in AWS serverless architecture

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https://docs.aws.amazon.com/lambda/latest/dg/create-deployment-pkg-zip-java.html

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MessageFilter - read from mailbox folder and return filtered list of messages.

Inputs: mailbox configuration, filter id
Outputs: dynamic folder of messages

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FilterAdd - create/update filter used to prove a subset of messages from a mailbox
Inputs: filter properties
Outputs: filter name

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MessageSaveAttachments - extract attachments from message and optionally store

Inputs: message payload, attachment id, storage expiry
Outputs: attachment storage location

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MailboxCreate - provision ses receipt rules to save in S3 bucket (key = address/inbox)