Move boto3 from core to aws

**Describe the bug**
the [requirements.txt](https://github.com/bitovi/bitops/blob/main/requirements.txt) in the base contains `boto3` which is for AWS. That package installation should be moved to the [aws plugin](https://github.com/bitops-plugins/aws)

**To Reproduce**
Steps to reproduce the behavior:
1. check out the main branch
2. ensure no plugins in `bitops.config.yaml`
3. run a docker build (e.g. `docker build -t bitops:local .`)
4. Notice that `boto3` is being installed

**Expected behavior**
1. check out the main branch
2. ensure no plugins in `bitops.config.yaml`
3. run a docker build (e.g. `docker build -t bitops:local .`)
4. Notice that *no* `boto3` is being installed
5. Add the aws plugin
6. run a docker build again
7. Notice that `boto3` is being installed

Start with requirements.txt and the Docker build described in the reproduction steps, then review how the aws plugin is added. Verify that a core build without plugins does not install boto3, while a build including the aws plugin does; confirm both scenarios with the provided docker build command.

Written by the indexing model from the issue text.