fix: refactor code, attach expres async router, fix typescript issues

[anahit42]

Description

• a lot of code is just moved to separate files for readability
• the server lacked basic routing practices we use, it had old code style etc.
• refactored to more or less similar structure
• fixed issue with bullmq typings

This is a

• Bug Fix
• Feature
• Documentation
• Other

Checklists

Commit style

• Changes are on a branch with a descriptive name eg. fix/missing-queue, docs/setup-guide

• Commits start with one of feat: fix: docs: chore: or similar

• No excessive commits, eg: there should be no fix: commits for bugs that existed only on the PR branch (see guide-to-interactive-rebasing)

Protected files

The following files should not change unless they are directly a part of your change.

• yarn.lock (unless package.json is also modified, then only the new/updated package should be changed here)

• package.json (renovate bot should handle all routine updates)

• package-lock.json (Should not exist as this project uses yarn)

• tsconfig.json (only make it stricter, making it more lenient requires more discussion)

• tslint.json (only make it stricter, making it more lenient requires more discussion)

[thiago-juro]

LGTM