Serde based serialization support and misc utilities for working with Dynamodb via the rusoto_dynamodb crate.

Features:

• Automatically convert your types to/from rusoto_dynamodb data types VIA serde_json. This is an alternative to serde_dynamodb (which is mostly unimplemented).
• Query/Conversion Macros

API Example:

```rust use dynamodb_data::*; use std::collections::HashMap;

let payload: HashMap = fields!{ id => ::uuid::Uuid::newv4(), name => "user name", counter => 0 }; let getitemquery = rusotodynamodb::GetItemInput { key: fields!{ id => ::uuid::Uuid::new_v4() }, ..Default::default() }; ```

WARNING:

As we all know and love, DynamoDB rejects empty strings in favor of null without any metadata as to what the original type is… As a workaround I’m experimenting with encoding emptying strings VIA the ASCII null character (unless anyone has a better idea).

This should presumably be more robust than using e.g. the suggested idea here. I haven’t read about this anywhere so perhaps I’m the first to use such a workaround. If the null encoding causes issues I can add a feature to disable the default behavior.