Add intel to implement 1

[schettn]

Now the intel is added. It uses the reducer, client and utils in order to provide
the needed functionality.

Checklist:

• Have you added an explanation of what your changes do and why you'd like them to be included?
• Have you updated or added documentation for the change?
• Have you tested your changes with successful results?

Type of Changes:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

What is the current behavior? (link to any open issues here)

• Currently there are no ways to append source objects to the intel. There should be multiple ways to call the intel append #11
• Currently there is to automatic retry on appending errors. There should be a automatic retry when an intel append fails #12

What is the new behavior (if this is a feature change)?

• Now there are two ways to call the intel append. There should be multiple ways to call the intel append #11
• Now there is a retry functionality which recalls the intel append n times. There should be a automatic retry when an intel append fails #12

Other information:

• Ref: https://github.com/snek-at/client
• Ref: Snek-Reducer Add reducer 2 to implement 1 #15
• Ref: Snek GitHub Utils Add utils GitHub 1 to implement 1 #16

[kleberbaum]

Should be ok to merge after a few changes.

[kleberbaum]

Should be ok to merge after a few changes.

[kleberbaum]

Should be ok to merge.