New module: Cloudtrail

[RothAndrew]

Changes

• Introduces a new module for creating a CloudTrail and removes the creation of a CloudTrail from the Bastion module
• Some other misc small refactors
• Intentionally does NOT create a cloudtrail in the examples/complete root module, due to the hard limit of 5 cloudtrails per region. The CloudTrail module has its own examples/complete folder with a root module that creates a cloudtrail. This module is NOT included in this repo's automated testing. This is setting up the module for being extracted to its own repo, where it will have an automated testing pipeline that runs when changes are made to it.

Closes #164

[brianrexrode]

lgtm

[ntwkninja]

🙌 🚀