mapped grants to revenue row

[yumi520]

ℹ️ Issue #392

Closes #392

📝 Description

Briefly list the changes made to the code:

1. created a function to get all the active grants
2. function to map active grants
3. wrote test

✔️ Verification

test passed

[prooflesben]

This logic should be in the frontend, in the fetchRevenues method.