feat: 9 factory

[bufander]

Description

Added Vault Factory contract and tests

Fixes #9

Checklist

• [x] I have run vyper and solidity linting
• [x] I have run the tests on my machine
• [x] I have followed commitlint guidelines
• [x] I have rebased my changes to the latest version of the main branch

[bufander]

Added the Factory to conftest, so all vaults used in the tests use a vault deployed with it