Migrate from flask_githubapp to gidgethub

[shreekarSS]

Signed-off-by: Shreekara sshreeka@redhat.com

Related Issues and Dependencies

Fixes: https://github.com/thoth-station/ttm-as-a-service/issues/23

[Gkrumbach07]

Other changes for migrating over to using aiohttp:

• [ ] You will have to remove wsgi.py and gunicorn.conf.py as it is no longer used.
• [ ] change port to 8080 now
  • [ ] also here
  • [ ] and here
• [ ] dont need this
• [ ] update Pipfile and Pipfile lock. need to add/remove new old modules used.

[sesheta]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Gkrumbach07

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/thoth-station/ttm-as-a-service/blob/main/OWNERS)~~ [Gkrumbach07] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment