Add side in FeederResult

[colinepiloquet]

Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem?

No

What kind of change does this PR introduce?

Fix

What is the current behavior?

In case of FeederResult on a branch, there is no way to know if it is on side 1 or 2.

What is the new behavior (if this is a feature change)? Side is added as a variable.

Does this PR introduce a breaking change or deprecate an API?

• [ ] Yes
• [x] No