Add VSCode tasks

[issy]

Initial Checklist

• Has @tigattack / @kdavis / @issy been added as a reviewer?
• If applicable, have the relevant project(s), milestone(s), and label(s) been applied?
• If applicable, have you added details of the cog to the readme as per README.md?

Details

• Does this resolve an issue?
  Completes part of Add IDE tasks to replicate CI workflows #144

Changes

New Features

• Adds VSCode tasks which mimic the CI workflows
• Adds Flake8 config so it doesn't clash with Black on certain things

Additional

To run the tasks locally just open the repo in VSCode, open the command palette and type in run task. This will give you a list of the available tasks you can run. Most of these tasks also have problem matchers, so if it detects issues with the code it will flag the exact line and column in the problems tab of VSCode

[tigattack]

Bangin, thanks Issy.