Allows to load big schematics into redis and load again

Proposed changes

This pr implements async loading and saving of clipboards. That helps to reduce lags and allows to load big clipboards

Types of changes

What types of changes does your code introduce to this project? Put an x in the boxes that apply

[X] Bugfix (non-breaking change which fixes an issue)
[X] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

[X] I have read the CONTRIBUTING.md
[X] I have added tests that prove my fix is effective or that my feature works
[X] I have added necessary documentation (if appropriate)

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

IntellectualSites / ClipboardConnect