feat: Proposers claim proving rights

l1-contracts/src/core/Leonidas.sol

@@ -320,6 +320,17 @@ contract Leonidas is Ownable, ILeonidas {
     return _ts < GENESIS_TIME ? Slot.wrap(0) : SlotLib.fromTimestamp(_ts - GENESIS_TIME);
   }
 
+  /**
+   * @notice  Computes the epoch at a specific slot
+   *
+   * @param _slotNumber - The slot number to compute the epoch for
+   *
+   * @return The computed epoch
+   */
+  function getEpochAtSlot(Slot _slotNumber) public pure override(ILeonidas) returns (Epoch) {
+    return Epoch.wrap(_slotNumber.unwrap() / EPOCH_DURATION);
+  }
+
   /**
    * @notice  Adds a validator to the set WITHOUT setting up the epoch
    * @param _validator - The validator to add