Pydantic-dynamo

* Add implementation to support `AbstractAsyncContextManager` to `DynamoRepository`
* Supports `async with DynamoRepository(...) as repo:` usage
* Add implementation nto support `AbstractContextManager` to `SyncDynamoRepository`
* Supports `with SyncDynamoRepository(...) as repo:` usage

* Introduce `v2` `DynamoRepository`
* Adds dependency to `aioboto3` to support async/await operations for all repository functions
* Read operations return instances of `PartitionedContent` to support object versioning and easier updates
* Introduce `v2` `SyncDynamoRepository`
* Wraps the asynchronous `DynamoRepository` implementation to provide a synchronous API

The original release of this package that contained only V1 functionality.
Usage is documented in [v1.md](./docs/v1.md)