Cloud Assembly API

This module is part of the AWS Cloud Development Kit project.

It provides routines to save and load Cloud Assembly manifests, as defined in
the @aws-cdk/cloud-assembly-schema package.

A lot of this code used to live in the @aws-cdk/cx-api package, but has been
extracted from it to its own package. That original package used to define the
Cloud Executable <--> CDK CLI contract in both directions, but this
responsibility has now been split:

``
┌────────────────────────┐ @/cloud-assembly-api ┌────────────────┐
│ │────────────────────────▶│ │
│ Cloud Executable │ │ CDK CLI │
│ │◀────────────────────────│ │
└────────────────────────┘ @/cx-api └────────────────┘
``