Dynamodump

🔧 Maintenance
- Set up automated Docker image publish via GitHub Action workflow as previous automated builds on [Docker Hub ](https://hub.docker.com/r/bchew/dynamodump)no longer works on free/OSS tier (https://github.com/bchew/dynamodump/pull/73)

🚀 Improvements (https://github.com/bchew/dynamodump/pull/71)
- Restructure project and added configs for packaging
- Add build and publish to PyPI GitHub Action
- Published to PyPI: https://pypi.org/project/dynamodump/

⚠️ BREAKING CHANGES
- Deletion of tables would now require a confirmation (https://github.com/bchew/dynamodump#script-unattended-usage). To restore previous behaviour, `--noConfirm` would need to be added (https://github.com/bchew/dynamodump/pull/51) thanks adam-operatingops

🚀 Improvements
- `boto2` dependency removed (https://github.com/bchew/dynamodump/pull/69) thanks jaecktec

🔧 Maintenance (https://github.com/bchew/dynamodump/pull/70)
- Upgrade `Dockerfile` to use `alpine3.14` base
- Freeze versions used in `requirements.txt` and added a separate `requirements-dev.txt` for dev dependencies
- Introduce `black` for code formatting and adjusted `flake8` rules to suit, reformatted all code using black
- Introduce pre-commit hooks for linting using `black` and `flake8`

- Skip throughput update on restore
- Migrate CI from Travis CI to GitHub actions
- Update Dockerfile to use Python 3

1. Added `Prefix` to the `s3.list_objects_v2` request to speed up the search.
1. Fixed a bug related to filename mapping during restore; should use `args.dumpPath` instead of`dump`.

Thanks kyhau