lib,rlc_am_nr: unit tests for NACK merging

lib/include/srsran/rlc/rlc_common.h

@@ -183,6 +183,15 @@ struct rlc_status_nack_t {
     has_nack_range = false;
     nack_range     = 0;
   }
+
+  bool equals(const rlc_status_nack_t& other) const
+  {
+    return nack_sn == other.nack_sn && has_so == other.has_so && so_start == other.so_start && so_end == other.so_end &&
+           has_nack_range == other.has_nack_range && nack_range == other.nack_range;
+  }
+
+  bool operator==(const rlc_status_nack_t& other) const { return equals(other); }
+  bool operator!=(const rlc_status_nack_t& other) const { return not equals(other); }
 };
 
 // STATUS PDU