Add command lines `orion db dump` and `orion db load`

[notoraptor]

Description

Hi @bouthilx ! This is a PR to fix #953 . Commands orion db dump and orion db load are added.

• orion db dump show already fully work
• orion db load should work with parameter --exp, and for full import if there is no ID collision.

TODO

• Make orion db load work when there is ID collision on full import.
• Add testing

Changes

Add commands orion db dump and orion db load

Checklist

Tests

• [ ] I added corresponding tests for bug fixes and new features. If possible, the tests fail without the changes
• [ ] All new and existing tests are passing ($ tox -e py38; replace 38 by your Python version if necessary)

Documentation

• [ ] I have updated the relevant documentation related to my changes

Quality

• [ ] I have read the CONTRIBUTING doc
• [ ] My commits messages follow this format
• [ ] My code follows the style guidelines ($ tox -e lint)