MAPEX-36: Write YAML into CSV and JSON

[emeth1]

Fixes #36

What Changed

1. Parsed mapping written into yaml, json, and csv files
2. Mappings parsed into newest iteration of the unified data schema

Limitations

1. Schema will likely be iterated on, and the data structures may need to change.
2. Some project metadata fields are empty
3. It has not yet been decided whether each attack object will have a metadata object attached to it, or if there will be only one metadata object per project. In this iteration of the parsings, each attack object has a metadata object attached.

[mikecarenzo]

Let's collect all the AWS mappings into a single CVE and JSON file. Likewise for the Google and Azure mappings. It'll make managing each security stack mapping a lot easier.