Switch to poetry and pyproject so we're installable as a pip package

[technillogue]

like so: https://github.com/technillogue/rinkbot

template to clone/fork and change: https://github.com/mobilecoinofficial/forestbot-template

• add pyproject and poetry.lock
• move mypy.ini and pylintrc to pyproject; change name
• fix toml
• fix metadata
• add a new sample dockerfile using poetry
• fix ROOT_DIR
• 3% test coverage ayyy

[itdaniher]

can we roll mobfriend etc over to poetry too in this same commit? maybe document the migration procedure from pipenv?

[technillogue]

will try to do, slightly tricky because of branch references will stop being valid once it's merged migration procedure is to just write a pyproject.toml following the template in sample_bots/pyproject.toml with any additional dependencies your bot has, poetry lock it, and update the dockerfile following the example in top level Dockerfile (which notably features no longer doing the graal compile job, but makes it harder for us to use unreleased commits)

[technillogue]

not entirely sure it makes sense to update contact, imogen, or echopay since there's work being done on them in unmerged branches?

also needs to use poetry in ci with a superset of deps

[technillogue]

@itdaniher okay, this switches ci, mobfriend, contact, and echopay but not imogen to poetry. what do you think?

this will also resolve #141